catch out

Short definition from Wiktionary

Verb

1. 1
   To discover or expose as fake, insincere, or inaccurate.
2. 2
   To take (someone) by surprise.
3. 3
   To put a batsman out by catching the batted ball before it touches the ground.
4. 4
   To leave an area by jumping on a train; to ride the rails away.