mid-15c., "to sigh," from Old French souspirer (Modern French soupirer), or directly from Latin suspirare "to draw a deep breath, heave a sigh," from assimilated form of sub "under" (see sub-) + spirare "to breathe" (see spirit). Related: Suspired; suspiring; suspiral; suspirious.[suspire etymology, suspire origin, 英语词源]