start in on

Idioms & Phrases

start in on

  1. Begin doing something, as in We started right in on the repairs. Also see start in.

  2. Attack, especially verbally, as in Nancy keeps starting in on Carl, complaining about the errors in his work. [Early 1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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