Tonight
来自Big Physics
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Old English tō niht, from the preposition to + night. Compare with today and tomorrow.
wiktionary
From Middle English tonyght, to niȝt, from Old English tō niht.
etymonline
tonight (adv.)
Old English toniht "in the coming night," from to "at, on" (see to) + niht (see night). As a noun, "in the night after the present day," early 14c. Written as two words until 18c., after which it was to-night until early 20c.
