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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 (one) out of (something)
To swindle something from someone. That con man chiseled us out of thousands, I'm ashamed to say.
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!