chisel in on someone/something
chisel in on (someone or something)
slang To gain part of or involvement in something by unfair methods. Any time my parents give me money, my brother manages to chisel in on it by whining to them.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
chisel in (on someone/something)
in. to use deception to get a share of something. I won’t chisel in on your deal.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.