Give me five

If someone says this, they want to hit your open hand against theirs as a way of congratulation or greeting.

Give someone a leg up

If you give someone a leg up, you help them to achieve something that they couldn't have done alone.

Give someone a piece of your mind

If you give someone a piece of your mind, you criticise them strongly and angrily.

Give someone a run for their money

If you can give someone a run for the money, you are as good, or nearly as good, as they are at something.

Give someone enough rope

If you give someone enough rope, you give them the chance to get themselves into trouble or expose themselves. (The full form is 'give someone enough rope and they'll hang themselves)

Give someone stick

(UK) If someone gives you stick, they criticise you or punish you.

Give someone the runaround

If someone gives you the runaround, they make excuses and give you false explanations to avoid doing something.

Give the nod

(UK) If you give the nod to something, you approve it or give permission to do it.

Give up the ghost

People give up the ghost when they die.  Machines stop working when they give up the ghost.

Give your eye teeth

If you really want something and would be prepared to sacrifice a lot to get it, you would give your eye teeth for it.

Given the day that's in it

(Irish) This idiom is used when something is obvious because of the day that it occurs: traffic, for example would be busy around a football stadium on game day, given the day that's in it. On any other day the traffic would be unexplainable, but because its game day its obvious why there is traffic.

Glass ceiling

The glass ceiling is the discrimination that prevents women and minorities from getting promoted to the highest levels of companies and organisations.

Glimmer of hope

A glimmer of hope is the belief that there is a slight chance that something positive will happen.

Glory hound

A glory hound is a person seeking popularity, fame and glory.

Gloves are off

When the gloves are off, people start to argue or fight in a more serious way. ('The gloves come off' and 'take the gloves off' are also used. It comes from boxing, where fighters normally wear gloves so that they don't do too much damage to each other.)

Glutton for punishment

If a person is described as a glutton for punishment, the happily accept jobs and tasks that most people would try to get out of. A glutton is a person who eats a lot.

Gnaw your vitals

If something gnaws your vitals, it troubles you greatly and affects you at a very deep level. ('Gnaw at your vitals' is also used.)

Go against the grain

A person who does things in an unconventional manner, especially if their methods are not generally approved of, is said to go against the grain. Such an individual can be called a maverick.

Go awry

If things go awry, they go wrong.

Go bananas

If you go bananas, you are wild with excitement, anxiety, or worry.

Go blue

If you go blue, you are very cold indeed. ('Turn blue' is an alternative form.)

Go bust

If a company goes bust, it goes bankrupt.

Go by the board

When something has gone by the board, it no longer exists or an opportunity has been lost.

Go by the boards

If something goes by the boards, it fails to get approved or accepted.

Go down a storm

To say that something has been enjoyable or successful, you can say that it has gone down a storm. Eg. Last night's party went down a storm, it was incredible.

Go down like a cup of cold sick

(UK) An idea or excuse that will not be well accepted will go down like a cup of cold sick.

Go down like a lead balloon

(UK) If something goes down like a lead balloon, it fails or is extremely badly received.

Go down swinging

If you want to go down swinging, you know you will probably fail, but you refuse to give up.

Go down without a fight

If someone goes down without a fight, they surrender without putting up any resistance.

Go Dutch

If you go Dutch in a restaurant, you pay equal shares for the meal.

Go fly a kite

(USA) This is used to tell someone to go away and leave you alone.

Go for broke

If someone goes for broke, they risk everything they have for a potentially greater gain.

Go for the jugular

If you go for the jugular, you attack someone where they are most vulnerable.

Go fry an egg

(USA) This is used to tell someone to go away and leave you alone.

Go hand in hand

If things go hand in hand, they are associated and go together.

Go haywire

When something goes haywire, it is completely out of control and erratic.

Go nuts

If someone goes nuts, they get excited over something.

Go off on a tangent

If someone goes off on a tangent, they change the subject completely in the middle of a conversation or talk.

Go over like a lead balloon

(USA) If something goes over like a lead balloon, it will not work well, or go over well.

Go overboard

If you go overboard, you do something excessively.

Go pear-shaped

(UK) If things have gone wrong, they have gone pear-shaped.

Go play in traffic

This is used as a way of telling someone to go away.

Go pound salt

(USA) This means 'Get lost' or 'Go away'('Go pound sand' is also used.)

Go round in circles

If people are going round in circles, they keep discussing the same thing without reaching any agreement or coming to a conclusion.

Go south

If things go south, they get worse or go wrong.

Go spare

(UK) If you go spare, you lose your temper completely.

Go tell it to birds

This is used when someone says something that is not credible or is a lie.

Go the distance

If you go the distance, you continue until something ends, no matter how difficult.

Go the extra mile

If someone is prepared to go the extra mile, they will do everything they can to help or to make something succeed, going beyond their duty what could be expected of them .

Go the whole hog

If you go the whole hog, you do something completely or to its limits.

Go through the mill

If you go through the mill, you have a very unpleasant experience.  If you put someone through the mill, you make them undergo an unpleasant experience.

Go through the motions

When you go through the motions, you do something like an everyday routine and without any feelings whatsoever.

Go to the mat

(USA) If people go  to the mat, they continue to struggle or fight to the end, until they have either won or have finally been defeated.  

Go to seed

If someone has gone to seed, they have declined in quality or appearance.

Go to the wall

If a company goes to the wall, it goes bust or fails.