英语词源字典 - 在线词源网站

downscale (v.)[downscale 词源字典]: 1945, American English, from down (adv.) + scale (v.). From 1966 as an adjective.[downscale etymology, downscale origin, 英语词源]
downside (n.): 1680s, "underside," from down (adv.) + side. Meaning "drawback, negative aspect" is attested by 1995.
downsize (v.): 1986 in reference to companies shedding jobs; earlier (1975) in reference to U.S. automakers building smaller cars and trucks (supposedly a coinage at General Motors), from down (adv.) + size (v.). Related: Downsized; downsizing.
downspout (n.): 1896, from down (adv.) + spout (n.).
downstairs (adv., adj.): 1590s, from down (adv.) + stairs (see stair).
downstream (adv., adj.): 1706, from down (prep.) + stream (n.).