let have it
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Related to let have it: let it go
let (one) have it
To verbally attack or strongly reprimand one. When the boss finds out that I was responsible for this printing error, he's really going to let me have it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
let someone have it (with both barrels)
Fig. to strike someone or attack someone verbally. (With both barrels intensifies the phrase; it alludes to firing a double-barreled shotgun.) I really let Tom have it with both barrels. I told him he had better not do that again if he knows what's good for him. Bob was really angry and let John have it—with both barrels.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
let (someone) have itInformal
1. To beat, strike, or shoot at someone.
2. To scold or punish.
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.