Piggy in the middle British noun uncountable
A children's game in which two players throw a ball over the head of someone trying to catch it.
I used to play the game, piggy in the middle when I was a child.
Someone who finds themselves in the middle of an argument between two people or groups and refuses to take sides.
My parents is quarreling. I don't want to be a piggy in the middle, so I leave as fast as possible.
Sometimes I'm like a piggy in the middle when my two younger brothers fight. I don't want to hurt both of them.
The phrase is of unknown derivation.
If you swallow the bait, you take something that someone offers you, or agree to do something that someone asks you to do without knowing that it is a trick or way of getting something from you.
You can't just do whatever he wants you to do. Don't swallow the bait.