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“It’s raining cats and dogs”
it is raining very heavily, or a lot of rain is falling at one time.
"Keep a straight face"
to keep yourself from smiling or laughing
"Barking up the wrong tree"
following the wrong course of action because their beliefs or ideas about something are incorrect.
"Monkey business"
silly
"Kill two birds with one stone"
Get two things done with a single action
"Rome wasn't built in a day"
it takes a long time to do a job or task properly, and you should not rush it or expect to do it quickly
"Under the weather"
feel slightly ill
"Once in a blue moon"
very rarely
"Small world"
used to show surprise when one meets someone one knows at an unexpected place or finds out that one shares a friend, acquaintance, etc., with another person. You know him, too? Wow, it's a small world.
"That's the last straw"
Patience has run out
"Who let the cat out of the bag"
reveal a secret carelessly or by mistake
"Great minds think alike"
said to someone just after you have discovered that they have had the same idea as you
"Cost an arm and a leg"
extremely expensive
"Break a leg"
Good luck. Used often when someone has a performance.
"We'll cross that bridge when we come to it"
Let's not talk about that problem right now
"Don't count your chickens before they're hatched"
don't assume you they will be successful or get something, when this is not certain
"They worked against the clock"
in a great hurry, as fast as possible
"It's all Greek to me"
You can't understand it at all
"Beat around the bush"
Avoid saying what you mean, usually because it is uncomfortable
Wrap your head around something
Understand something complicated
"A piece of cake"
easy
"A picture is worth a thousand words"
it is often easier to show something in a picture than to describe it with words.
"Throw in the towel"
to quit in defeat
"Bite the bullet"
To get something over with because it is inevitable
"You can say that again"
That's true, I agree