Meaning of “catch” - Learner’s Dictionary

catch

noun [ C ] uk us /kætʃ/
WITH HANDS

the act of catching something that is moving through the air:

a brilliant catch
FISH

the amount of fish that someone has caught

PROBLEM

a hidden problem or difficulty with something:

He's offering us a free flight? There must be a catch.
LOCK

a part on something that fastens it and keeps it closed:

a safety catch

(Definition of “catch noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)