brunchyoudaoicibaDictYouDict[brunch 词源字典]
1896, British student slang merger of breakfast and lunch.
To be fashionable nowadays we must 'brunch'. Truly an excellent portmanteau word, introduced, by the way, last year, by Mr. Guy Beringer, in the now defunct Hunter's Weekly, and indicating a combined breakfast and lunch. ["Punch," Aug. 1, 1896]
[brunch etymology, brunch origin, 英语词源]