Backwards
来自Big Physics
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Middle English: from earlier abackward, from aback.
wiktionary
From backward + -s. See also -s(“used in the formation of certain adverbs: backwards, downwards, inwards, etc.”).
From Middle English bakwardis, bakwardis, a variant of Middle English bakwarde, bakward(“backward”). Equivalent to backward + -s.
etymonline
backwards (adv.)
1510s, from backward with adverbial genitive -s. Figurative phrase bend over backwards is recorded from 1901.
