to become the owner of (something) by paying or agreeing to pay money for it

to obtain (something), often by some sacrifice

We have bought ourselves a little more time

to secure the cooperation of (somebody) by bribery

to be the purchasing equivalent of (an amount)

The pound buys less today than it used to

informal to believe or accept (something said or proposed)

I don't buy that

to work as a buyer for a shop or other business