chisel in on (someone or 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.
See also: chisel, on

chisel in (on someone/something)

in. to use deception to get a share of something. I won’t chisel in on your deal.
See also: chisel, on, someone, something