Meaning of “treat” - Learner’s Dictionary

treat

verb [ T ] uk us /triːt/
DEAL WITH

B2 to behave towards or deal with someone in a particular way:

He treats her really badly.
She felt she'd been unfairly treated by her employer.
They treat her like one of their own children.
CONSIDER

B2 to consider something in a particular way:

He treated my suggestion as a joke.
ILLNESS/INJURY

B2 to give medical care to someone for an illness or injury:

He's being treated for cancer at a hospital in California.
SPECIAL

B2 to do or buy something special for someone:

I'm going to treat her to dinner at that nice Italian restaurant.
PROTECT

to put a substance on something in order to protect it:

The wood is then treated with a special chemical to protect it from the rain.

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