buy something

buy it

1. slang To believe that something is true. My brother says that his latest scheme will make millions, but I'm not buying it. I told the teacher that my dog ate my homework, and she totally bought it! At least I think she did.
2. slang To die. When Ray got back last night, he told the boss that the informant bought it and won't be a problem anymore.
See also: buy
Farlex Dictionary of Idioms.

buy something

Believe something; accept as true or satisfactory. For example, You think he's a millionaire? I just won't buy that. [Slang; 1920s]
See also: buy, something
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • buy it
  • not buy
  • not buy (something)
  • bark at
  • bark at (someone or something)
  • buy in
  • angle for
  • angle for (something)
  • angle at (something)
  • brains
References in classic literature
In Paris we often saw in shop windows the sign "English Spoken Here," just as one sees in the windows at home the sign "Ici on parle francaise." We always invaded these places at once--and invariably received the information, framed in faultless French, that the clerk who did the English for the establishment had just gone to dinner and would be back in an hour--would Monsieur buy something? We wondered why those parties happened to take their dinners at such erratic and extraordinary hours, for we never called at a time when an exemplary Christian would be in the least likely to be abroad on such an errand.
I wanted to buy something from him to help him in such a worthy object.
"I was driving past Yusupov's house just now," said Berg with a laugh, "when the steward, a man I know, ran out and asked me whether I wouldn't buy something. I went in out of curiosity, you know, and there is a small chiffonier and a dressing table.
Arthur silently resolved that he would make Bessy a present of money before the day was over, that she might buy something more to her mind; but she, not aware of the consolation in store for her, turned out of the open space, where she was visible from the marquee, and throwing down the odious bundle under a tree, began to cry--very much tittered at the while by the small boys.
Your woman has a gown, and her whole seven weeks wages are gone; ours has a gown, and two days' wages left, to buy something else with.
I thought I saw what was coming, but I said ingenuously, "Do you want to buy something?"
"Brother Claude, give me at least one little parisis to buy something to eat."
I took heart to tell him that I had had nothing all night, and that if he would allow me to buy something to eat, I should be very much obliged to him.
Cassandra was driven finally, by her own unrest, to put on her clothes and wander out along the streets of Chelsea, on the pretence that she must buy something. But, in her ignorance of the way, she became panic-stricken at the thought of being late, and no sooner had she found the shop she wanted, than she fled back again in order to be at home when William came.
Pressed hard, he said that he would take five dollars, because he wanted to buy something for a girl.
Or you could buy something you actually want to read.
But sadly, the disabled can be seen in every street in order to get a little money to buy something for eating, leave alone education, healthcare facilities, job opportunities and other basic necessities of life.
Area people said that the twins, Zaheer and Zohra, had left home to buy something but fell into the sewer within the locality.
It's also not uncommon to buy something in a size too small as an incentive to lose weight or because it's in the sale and they don't have your usual size.
13, that he purchased the winning ticket after forgetting to buy something at the grocery store.