Guess the origin!
Add fuel to the fire
If you pour water onto a fire, it goes out, but adding fuel makes it burn brighter/get bigger.
Beware of Greeks bearing gifts
To be suspicious or skeptical
An odd sensation in your stomach, usually when you're nervous
Butterflies in your stomach
Kick the bucket
Hint: Was said/used during a type of criminal punishment in the 16th century
This idiom was originally formed when hanging was used as an execution tactic. A bucket was kicked out from underneath the prisoner, causing them to die.
Birds of a feather flock together
People who are alike/have things in common often become friends
To become more stable, refocused, or calm
Pull yourself together
Achilles' heel
Hint: Comes from a story about a strong warrior (Achilles) in a Greek book called the Iliad (a story about the trojan war).
Achilles was indestructable everywhere but his heel. He was shot in the heel with a poison arrow and died.
At the end of your rope
Meaning you've done something to the best of your ability
To be very alike, almost identical
Two peas in a pod
Bark up the wrong tree
Hint: Has to do with raccoon hunting
When hunting for raccoons, dogs would chase them up trees and bark. This was a signal to the hunter where his prey was, but the raccoons would sometimes escape, leaving the dog at the wrong tree.
On the warpath
To be very angry
To greatly impress
Sweep you off your feet
Saved by the bell
Hint: Has to do with boxing
When a boxer was knocked down/out or being beaten badly, the referee would count to 10 and a bell was rung, giving the boxer a break.
Flotsam and jetsam
Junk/ worthless objects
To be very strange or crazy
Mad as a hatter