There are a lot of Idioms which have the word “Leg” in them; here we have introduced some of them and also their meaning in the English language.
1) A Leg to stand on
It means a support or something you can lean on.
Example: He thinks that the reason for his failures in life is because of not having a leg to stand on.
2) A lie has no legs
It means that a lie can easily be revealed.
Example: You can't get away with a lie; a lie has no legs.
3) Break a leg
It’s a common phrase which is used for wishing someone good luck.
Example: I’m sure you’re the best actress in the world. Break a leg!
4) Cost an arm and a leg
It means something is too expensive and you can hardly afford it.
Example: I’d really love to travel around the world, but it will cost me an arm and a leg.
5) Have a leg up on someone
When you have a leg up on someone, it means that you’re better than him/her. Actually, it shows being ahead of someone.
Example: As long as I can remember, I was always jealous of my cousin because she was better than me in everything and my family kept saying that she had a leg up on me.
6) Sea legs
It actually refers to being able to walk easily on a moving ship, so its common use is when you want to explain someone is really skilled in a specific field.
Example: don’t worry; it’s the first day of your work in this company, you’ll get your sea legs soon.
7) To pull someone’s leg
This idiom is used when you make a joke of someone.
Example: you don’t need to worry about what they said, they’re always pulling someone’s leg.