Definition of an arm and a leg
informal
: a very large amount of money
It's a reliable car, and it doesn't cost an arm and a leg.
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“An arm and a leg.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/an%20arm%20and%20a%20leg. Accessed 9 Aug. 2022.
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