買う
ka-u
You can 'buy' resentment too — 買う is one exchange, two directions
The picture Money leaves your hand and, in its place, goods cross over to you. 買う gives money and takes the goods; 売る gives the goods and takes the money.
Where the picture shows up in 買う
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Money out, goods in
薬局で薬を買いました。
yakkyoku de kusuri o kai-mashita
I bought the medicine at the pharmacy.
A note crosses the counter one way and the bag of medicine crosses back into your hand.
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Coins in, ticket out
切符は券売機で買ってください。
kippu wa kenbaiki de katte kudasai
Please buy your ticket from the machine.
Coins go into the slot and a ticket drops out into the tray below.
The place of purchase is marked with ~で.
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Making the swap on the way
帰りにパンを買ってきます。
kaeri ni pan o katte ki-masu
I'll buy bread on the way back.
You stop at a shop on the way home and carry the bread on with you.
買ってくる is the set shape for 'buy and bring back'.
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Your money, their hands
子どもに靴を買ってあげました。
kodomo ni kutsu o katte age-mashita
I bought my child some shoes.
Money out of your wallet arrives as shoes on a child's feet.
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A remark out, a feeling back
その言い方は反感を買います。
sono iikata wa hankan o kai-masu
Talking like that will earn you resentment.
One remark of yours crosses over and a cold stare comes back in return.
反感を買う and 恨みを買う use the same verb with no money involved.
All of it in one picture
買う is two arrows crossing in opposite directions. Money goes, medicine comes, and you bought medicine; coins go into a machine, a ticket drops out, and you bought a ticket; make that swap on the way home and carry it back, and you bought something on the way; let your money land in someone else's hands as shoes, and you bought them shoes; let one remark go out and a cold look come back, and you bought yourself resentment. Anything you pay out and get something back for can take 買う.