Meaning of “buy” - Learner’s Dictionary

buy

verb [ T ] us uk /baɪ/ past tense and past participle bought
I've bought myself a new coat.They've just bought a place in Spain.I've bought a few clothes for the new baby.To show our appreciation, we've bought you a little gift.We're hoping to buy a house together.

A1 to get something by paying money for it:

I went out to buy some milk.
They bought / their house for $1,000,000.
[ + two objects ] He bought me a camera for my birthday.

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