not buy (something)(redirected from one isn't buying it)
not buy (something)
To not accept or believe something as the truth. My brother says that his latest scheme will make millions, but I'm not buying it. The teacher didn't buy my story about the dog eating my homework.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
not buy something
Fig. not accept something (to be true). You may think so, but I don't buy it. The police wouldn't buy his story.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.