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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. Suffer a severe reversal, as in If they can't raise the money in time, they'll buy it. [Slang; mid-1900s]
2. Be killed; die. For example, By the time we could get to the hospital, he had bought it. Originating during World War I as military slang, this term later was extended to peacetime forms of death. A later slang equivalent is buy the farm, dating from about 1950. For example, He'll soon buy the farm riding that motorcycle. According to J.E. Lighter, it alludes to training flights crashing in a farmer's field, causing the farmer to sue the government for damages sufficient to pay off the farm's mortgage. Since the pilot usually died in such a crash, he in effect bought the farm with his life.
3. Believe it; see 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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
To be killed.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.