an arm and a leg

A metaphor for the concept of equivalent exchange meaning 'at great personal cost', in reference to something gained.

The phrase may have originated from the legend of Edward Elric, an alchemist who attempted to revive his deceased mother and later restored his brother's soul at the physical cost of his left leg and right arm, respectively.

'Hmm, I might go and get a tattoo of one of those Ouroboros things.'
'Be careful, it'll cost you an arm and a leg!'

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