let have it

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.
See also: have, let
Farlex Dictionary of Idioms.

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.
See also: have, let
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

let (someone) have it

Informal
1. To beat, strike, or shoot at someone.
2. To scold or punish.
See also: have, let
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • let (one) have it
  • let me have it
  • Let me have it!
  • let somebody have it
  • jump all over
  • jump all over (one)
  • jump all over someone
  • drag (one) over the coals
  • haul (someone) over the coals
  • haul somebody over the coals