c. 1300, from a Scandinavian source such as Old Norse myrr "bog, swamp," from Proto-Germanic *miuzja- (source of Old English mos "bog, marsh"), from PIE *meus- "damp" (see moss).
c. 1400, in figurative sense of "to involve in difficulties," from mire (n.). Literal sense is from 1550s. Related: Mired; miring.
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