What is the X in X-mas?
late 14c., from Old French respirer (12c.), from Latin respirare "breathe again, breathe in and out," from re- "again" (see re-) + spirare "to breathe" (see spirit (n.)). Related: Respired; respiring.
respire re·spire (rĭ-spīr')v. re·spired, re·spir·ing, re·spires
To breathe in and out; inhale and exhale.
To undergo the metabolic process of respiration.
To breathe easily again, as after a period of exertion.