Idioms are phrases or expressions that are either grammatically unusual, as in, “Long time, no see!”, or their meaning cannot be taken literally, as in, “It’s raining cats and dogs!”
Check out some more examples:
“A penny for your thoughts” is something that you say in order to ask someone who is being very quiet what they are thinking about.
If the ball is in someone’s court, they have to do something before any progress can be made in a situation.
“Not my cup of tea” means “Not what I like”.
For example: “Thank you for inviting me, but opera isn’t my cup of tea”
“Break a leg” is another way of wishing someone “Good Luck”, especially before a performance.