highlight (n.)youdaoicibaDictYouDict[highlight 词源字典]
1650s, originally of paintings, "the brightest part of a subject," from high (adj.) + light (n.). The figurative sense of "outstanding feature or characteristic" is from 1855. The verb is from 1861. Hairdressing sense is 1941 (n.), 1942 (v.). Related: Highlighted; highlighting. [highlight etymology, highlight origin, 英语词源]
balayageyoudaoicibaDictYouDict
"A technique for highlighting hair in which the dye is painted on in such a way as to create a graduated, natural-looking effect", 1970s: French, literally 'sweeping', from balayer 'to sweep'.