chisel in
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.
chisel in (on someone or something)
Sl. to use deception to get a share of something. I won't chisel in on your deal. You had better not chisel in!
chisel in
verbSee chisel in on someone/something