Meaning of “treat” - Learner’s Dictionary

treat

verb [ T ] us uk /triːt/
There are rules that govern how teachers treat children.We try to treat our students as individuals.He shouldn't treat you like that. Don't let him get away with it.He treats his mother like a slave.He treated her with grudging respect.
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)