In our language to the word to buy We attribute two uses to it, while the most widespread use that we give to the term is to designate the action of acquiring something, a good, a service, among others, from the delivery of a sum of money established by whoever trades the same. Once the amount is paid for that asset, we become the owner of it and as such we can use it in the way we want, as long as, of course, it does not affect a third party. I really wanted to buy this coffee maker, I finally did.
The action that results in counterpart to that of buying is the sell, which will involve delivering, assigning someone (the buyer) the ownership or domain of something in exchange for the delivery of a stipulated value.
And on the other hand, we also use the word buy to indicate that action that consists in the delivery of a certain amount of money to someone, or failing that, of some material good, with the mission of obtaining their favor in something or of making him change his position or action in relation to some matter of our interest.
Generally, the use of this sense of the word buy is closely related to those actions that involve illegal acts or totally removed from good customs and morals.
When the witness of a murder is offered an amount of money so that he does not declare the truth of the fact, what he is doing is buying his silence. In judicial matters this type of practice turns out to be very common and also in the field of politics it is another context in which it is common to buy the silence or the favor of someone to be able to satisfactorily fulfill some political objectives, which otherwise , that is to say, acting in a legal and correct way, it would be impossible to achieve. The ruling party had to buy the legislator's vote to achieve the sanction of the law.
That of acquire is the word that we normally use as a synonym for the word buy.