m 3 i 1 s 1 f 4 i 1 r 1 e 1
7 letters · 12 points in Scrabble
Meaning
noun an explosion that fails to occur
noun a failure to hit (or meet or find etc)
verb fail to fire or detonate
originEither a univerbation of earlier miss fire, or the compound mis- + fire (or possibly a confluence of both).
Etymology from Wiktionary, CC BY-SA 3.0