breathless (adj.)youdaoicibaDictYouDict[breathless 词源字典]
late 14c., "unable to breathe," from breath + -less. Meaning "out of breath, panting" is from mid-15c. Used from 1590s in the sense "dead." Meaning "forgetting to breathe due to excitement, awe, anticipation, etc." is recorded from 1802. Related: Breathlessly; breathlessness. [breathless etymology, breathless origin, 英语词源]