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What Does It Mean?

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From our dictionary:
manque

(mänk), n. French
the numbers 1 to 18 in roulette. Cf. passe.

man•qué

(man•qué), adj.
having failed, missed, or fallen short, esp. because of circumstances or a defect of character; unsuccessful; unfulfilled or frustrated (usually used postpositively): a poet manqué who never produced a single book of verse.