Common Idioms in English

good luck 
“You have an exam tomorrow? Break a leg!”

stop working on something
"I'm getting a bit tired now - let's call it a day. "

get out of control
"The party got out of hand and they had to call the police."

work better or leave
"It will get fired if you don't get your act together."
"She's so disorganized - I wish she'd get her act together."

Don't give up. Stay strong.
"Hang in there. I am sure things will work out in the end."
"I know things are tough right now, just hang in there."

tell something briefly 
"Long story short, despite all the opposition, they finally got married and are now happy together. "

make a long story short
cut a long story short
long story short

It's too late
"My friends are off to ski. I missed the boat this time, but I will join them next season."

to joke with someone, tease
"I panicked when he said the test was tomorrow, but then I realized he was just pulling my leg."

calm down
"Take a deep breath and pull yourself together. You'll be fine."

Things are going well so far
"How's the work on your house going?" "There's a lot more to do, but so far, so good."

The person we were just talking about showed up.
"Did you hear what happened to Anna yesterday - oh, speak of the devil, here she is."

understand something complicated
"I'm having trouble wrapping my head around this math problem."

sick
"Anne has been feeling under the weather with a cold all week, so she's been taking it easy."

Let's not talk about that problem right now.
"If we can't sell the house—well, we'll cross that bridge when we come to it."

We'll cross that bridge when we come to it.