"labor, toil," mid-13c., from Old French travail "suffering or painful effort, trouble" (12c.), from travailler "to toil, labor," originally "to trouble, torture," from Vulgar Latin *tripaliare "to torture," from *tripalium (in Late Latin trepalium) "instrument of torture," probably from Latin tripalis "having three stakes" (from tria, tres "three" + palus "stake"), which sounds ominous, but the exact notion is obscure. The verb is recorded from late 13c.