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Phrase(s): *in mint condition
Fig. in perfect condition. (*Typically: be ~; find something ~.) • This is a fine car. It runs well and is in mint condition. • We saw a house in mint condition and decided to buy it.
McGrawhill's American Idioms And Phrasal Verbs
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In excellent condition, unblemished, perfect, as in This car is in mint condition. This expression alludes to the condition of a freshly minted coin. [c. 1900]
American Heritage Idioms