What is the Meaning of the Idiom

to COST (or spend) AN ARM AND A LEG?

Definition:

It’s very expensive!

Examples:

1. Buying that new car cost me an arm and a leg.  I won’t be going anywhere for vacation this year.

2. My fitness club membership is costing me an arm and a leg. I am going to look into buying some equipment I can use at home.

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