Learner's definition of AGGRAVATE
to make (an injury, problem, etc.) more serious or severe
She aggravated an old knee injury.
They're afraid that we might aggravate an already bad situation.
A headache can be aggravated by too much exercise.
The symptoms were aggravated by drinking alcohol.
to make (someone) angry
to annoy or bother (someone)
[more aggravating; most aggravating]
It was an incredibly slow and aggravating process.
He has some very aggravating [=annoying, irritating] habits.