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an arm and a leg

aen arm aen leg
part of speech: noun
definition: (informal) a very large amount of money, in the speaker's opinion.
I spent an arm and a leg on that couch, so don't spill anything on it.I bet that car of his cost an arm and a leg.Those things used to be cheap, but they're asking an arm and a leg for them nowadays.I like lobster, but I'm not going to pay an arm and a leg for it.