yesterdayyoudaoicibaDictYouDict[yesterday 词源字典]
yesterday: [OE] The yester- of yesterday (and of yesteryear [19], coined by Dante Gabriel Rossetti) was originally a free-standing word, meaning ‘yesterday’, but by the time records of it in Old English begin it was already locked into a collocation with day. Its ultimate source is Indo-European *ghes, which also produced Latin herī (source of French hier, Italian and Romanian ieri, and Spanish ayer), Welsh doe, German gestern, and Dutch gisteren.
[yesterday etymology, yesterday origin, 英语词源]
yesterday (n., adv.)youdaoicibaDictYouDict
Old English geostran dæg; see yester- + day.