Tomorrow
来自Big Physics
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Middle English (as two words): from the preposition to + morrow. Compare with today and tonight.
wiktionary
From Middle English tomorwe, tomorwen, from Old English tōmorgen, tō morgenne, tōmergen(“tomorrow”, adverb), from tō(“at, on”) + morgene, mergen (dative of morgen(“morning”)), from Proto-Germanic *murganaz(“morning”), perhaps, from Proto-Indo-European *mergʰ-(“to blink, to twinkle”), equivalent to to- + morrow.
etymonline
tomorrow (adv.)
mid-13c., to morewe, from Old English to morgenne "on (the) morrow," from to "at, on" (see to) + morgenne, dative of morgen "morning" (see morn, also morrow). As a noun from late 14c. Written as two words until 16c., then as to-morrow until early 20c.
