A shoulder patch is worn on a uniform to signify membership in an organization.
Blue jeans might have patches for the purpose of decoration or repair.
An eye patch covers a damaged eye or an eye that needs protection.
A dog or a cat with a dark area over one eye is said to have a patch.
She has a black patch over one eye.
When a section of a road needs a repair, it’s patched. This is a concrete patch.
The word "patch" can be used as a verb.
simple
past
past participle
patch
patched
patched
They patched the road.
The road was patched with concrete.
She patched the knees on her pants.
I patched the holes on the siding of my house where birds were pecking at it.
Edgar and Rhonda had a hard time getting along with each other, but then they patched things up and now everything is fine. (To patch things up is an expression which means to repair a damaged relationship.)