up a tree

[up a tree] {adv.} or {adj. phr.} 1. Hunted or chased into a tree;treed.

The dog drove the coon up a tree so the hunter could shoothim.

2. {informal} in trouble; having problems; in a difficulty thatit is hard to escape or think of a way out of.

John's father hashim up a tree in the checker game.

Compare: UP THE CREEK.