It's raining cats and dogs.
It's raining heavily or a lot.
This is a piece of cake.
Something is easy.
Break a leg!
Good luck!
Don't cry over spilled milk.
Don't cry over something small.
feeling under the weather
feeling sick or unwell
Let's cut to the chase.
To get to the main point in a conversation or topic
You look like a million bucks!
You look great!
couch potato
someone who is lazy and spends their time sitting around
Hold your horses!
Calm down or slow down.
Take a chill pill.
Relax.
