Question 1

What does "wild goose chase" mean?

Accepted Answer

A search or pursuit of something that is impossible or pointless to find.

Question 2

How do you use "wild goose chase" in a sentence?

Accepted Answer

Looking for that document turned into a complete wild goose chase.

Question 3

Is "wild goose chase" formal or informal?

Accepted Answer

"wild goose chase" is informal — used mainly in casual conversation. Implies wasted effort pursuing something that cannot be found.