Read the dictionary definition of buy. All definitions for this word.
1. an advantageous purchase
1. she got a bargain at the auction
2. the stock was a real buy at that price
2. accept as true
1. I can't buy this story
3. obtain by purchase; acquire by means of a financial transaction
1. The family purchased a new car
2. The conglomerate acquired a new company
3. She buys for the big department store
4. acquire by trade or sacrifice or exchange
1. She wanted to buy his love with her dedication to him and his work
5. make illegal payments to in exchange for favors or influence
1. This judge can be bought
6. be worth or be capable of buying
1. This sum will buy you a ride on the train
See also:
Merriam-Webster definition of buy