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TSUMUGU · B2 · 詞
順手 word · B2
順手 ＝ 順 ＋ 手
ㄕㄨㄣˋ ㄕㄡˇ · shùn shǒu
adverb/adjective — conveniently in passing, while one is at it; (of a tool) handy, smooth to use.

字源 FORM — what the parts do

順along with, smoothly (順便)shùn
手hand (手指)shǒu
順手，順便的順，手指的手。