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1735, "a thrust with a sword," originally a fencing term, shortened from allonge, from French allonger "to extend, thrust," from Old French alongier "to lengthen, make long," from à "to" + Old French long, from Latin longus "long" (see long (adj.)).
1735 (implied in lunged), from lunge (n.). Sense of "to make a sudden forward rush" is from 1821. Related: Lunged; lunging.