Meaning of “patch” - Learner’s Dictionary

patch

noun [ C ] uk us /pætʃ/
AREA

a small area that is different from the area around it:

a bald patch.
There are icy patches on the road.
MATERIAL

a piece of material that you use to cover a hole in your clothes or in other material:

He had leather patches sewn on the elbows of his jacket.
EYE

a small piece of material used to cover an injured eye

LAND

a small area of land used for a particular purpose:

a bad/rough, etc patch

a difficult time:

I think their marriage is going through a bad patch.

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