Idioms with ANIMALS

the lion’s share
the largest part of something
The company has captured the lion’s share of the Asian market.

drop like flies
to not feel well and fall down in large numbers
The heat was so intense that people were dropping like flies.

take the bull by the horns
to deal with a difficult situation directly and confidently
She decided to take the bull by the horns and ask them to leave.

like a fish out of water
to feel uncomfortable in an unfamiliar situation
I felt like a fish out of water at my new school.

let the cat out of the bag
to reveal a secret, often by mistake
We wanted it to be a surprise, but Tom let the cat out of the bag.