Act of God
    An act of God is something like an earthquake or floods that human beings cannot prevent or control.

All hell broke loose
    When all hell breaks loose, there is chaos, confusion and trouble.

Amen
    Some use 'Amen' or 'Amen to that' as a way of agreeing with something that has just been said.

At the bottom of the totem pole
    (USA) If someone is at the bottom of the totem pole, they are unimportant. Opposite is at the top of the totem pole.

Baptism of fire
    A baptism of fire was a soldier's first experience of shooting. Any unpleasant experience undergone, usually where it is also a learning experience, is a baptism of fire.

Believe in the hereafter
    A belief in the hereafter is a belief in the afterlife, or life after death. It is, therefore, associated with religions and the soul's journey to heaven or to hell, whichever way being just deserts for the person based on how they led their life.

Better the devil you know
    This is the shortened form of the full idiom, 'better the devil you know than the devil you don't', and means that it is often better to deal with someone or something you are familiar with and know, even if they are not ideal, than take a risk with an unknown person or thing.

Between the devil and the deep blue sea
    If you are caught between the devil and the deep blue sea, you are in a dilemma; a difficult choice.

Broad church
    If an organisation is described as broad church, it is tolerant and accepting of different opinions and ideas.

Catch hell
    If you catch hell, you get into trouble or get scolded. ('Catch heck' is also used.)

Chapter and verse
    When you know something very well, and can quote it, you know it chapter and verse. 

Cold day in hell
    This is used as a prediction there is no chance some event or condition will ever happen.'There will be a cold day in hell before he manages it.'

Come hell or high water
    If someone says they'll do something come hell or high water, they mean that nothing will stop them, no matter what happens.

Cross to bear
    If someone has a cross to bear, they have a heavy burden of responsibility or a problem that they alone must cope with.

Devil finds work for idle hands
    When people say that the devil finds work for idle hands, they mean that if people don't have anything to do with their time, they are more likely to get involved in trouble and criminality.

Devil is in the detail
    When people say that the devil in the detail, they mean that small things in plans and schemes that are often overlooked can cause serious problems later on.

Devil may care
    If you live a devil-may-care life it means you are willing to take more risks than most people.

Devil's advocate
    If someone plays Devil's advocate in an argument, they adopt a position they don't believe in just for the sake of the argument

Doubting Thomas
    A Doubting Thomas is someone who only believes what they see themselves, not what they are told.

Face your demons
    If you face your demons, you confront your fears or something that you have been trying hard to avoid.

Fall from grace
    If a person falls from grace, they lose favor with someone.

Heaven knows
    If you ask someone a question and they say this, they have no idea.

Heavenly bodies
    The heavenly bodies are the stars.

Hell for leather
    If you do something hell for leather, especially running, you do it as fast as you can.

Hell in a handcart
    If something is going to hell in a handcart, it is getting worse and worse, with no hope of stopping the decline.

Holier-than-thou
    Someone who is holier-than-thou believes that they are morally superior to other people.

Holy smoke!
    This is a way of expressing surprise: "Holy smoke! Look at all of those geese!"

Hope in hell
    If something hasn't got a hope in hell, it stands absolutely no chance of succeeding.

Hot as Hades
    If something's as hot as Hades, it's extremely hot.

Idle hands are the devil's handiwork
    When someone is not busy, or being productive, trouble is bound to follow.
If Mohammed won't come to the mountain, the mountain must come to Mohammed
    If something cannot or will not happen the easy way, then sometimes it must be done the hard way.
If you lie down with the Devil, you will wake up in hell
    This means that if you become involved with bad company, there will be negative consequences.

Lap of the gods
    If something is in the lap of the gods, it is beyond our control and fate will decide the outcome.

Let the devil take the hindmost
    This idiom means that you should think of yourself and not be concerned about other people; look after yourself and let the devil take the hindmost.

Lord willing and the creek don't rise
    Pertains to the ability to accomplish a task or meet an obligation, barring unforseen complications. Example: "I will be at work tomorrow, Lord willing and the creek don't rise."

Man of the cloth
    A man of the cloth is a priest.

Man proposes, God disposes
    Your fate lies in the hands of God.

Move heaven and earth
    This expression indicates a person's determined intention of getting a work done in spite of all odds he may face. He will use all and every means to accomplish the target. Example: He moved heaven and earth to get his literary work recognised by the committee of experts.

Ninth circle of hell
    In Dante's Inferno, the ninth circle of hell is the centre where the worst punishments are found, so it is used idiomatically for something that couldn't get worse.

Not a snowball's chance in hell
    There is absolutely no possibility of something hapening if there's not a snowball's chance in hell.

Pastoral care
    This is used in education to describe the aspect of care offered to pupils that cover things besides learning.

Poor as a church mouse
    If soemone is as poor as a church mouse, they are very poor indeed.

Practise what you preach
    If you practise what you preach, you do what you say other people should do.(In American English, the verb is 'practice')

Preaching to the choir
    If someone preaches to the choir, they talking about a subject or issue with which their audience already agrees. ('Preaching to the converted' is an alternative form.)

Prodigal son
    A prodigal son is a young man who wastes a lot on money on a lavish lifestyle. If the prodigal son returns, they return to a better
way of living.

Saving grace
    If someone has some character defects, but has a characteristic that compensate for their failings and shortcomings, this is their saving grace.

Sell your soul
    If someone sells their soul, their betray the most precious beliefs.

Seventh heaven
    If you are in seventh heaven, you are extremely happy.

Sing from the same hymn sheet
    If people are singing from the same hymn sheet, they are expressing the same opinions in public.

Slough of despond
    If someone is very depressed or in despair, they're in a slough of despond.

Speak of the devil!
    If you are talking about someone and they happen to walk in, you can use this idiom as a way of letting them know you were talking about them.

Tempt providence
    If you tempt providence, you take a risk that may well have unpleasant consequences. ('Tempt fate' is also used.)

To err is human, to forgive divine
    This idiom is used when someone has done something wrong, suggesting that they should be forgiven.

Vale of tears
    This vale of tears is the world and the suffering that life brings.

When hell freezes over
    An impossible or very unlikely situation or event

Wing and a prayer
    If you do something on a wing and a prayer, you try to do something and hope you'll succeed even though you have very little chance of success.

Your sins will find you out
    This idiom means that things you do wrong will become known.