- head over heels (adv.)
[head over heels 词源字典]
- 1726, "a curious perversion" [Weekley] of Middle English heels over head (late 14c.). Head (n.) and heels long have been paired in alliterative phrases in English, and the whole image also was in classical Latin (per caput pedesque ire).[head over heels etymology, head over heels origin, 英语词源]