由来 yóulái HSK7 origin Origin Definitions Defs Strokes Stroke Words Sentences Sents yóulái origin 由 yóu noun [reason] (bound form) cause; reason; source来 來 lái verb to come To come; to arrive; to move toward the speaker; to crop up or happenyóulái since the beginning 由 yóu preposition from from; starting at a place or time来 來 lái prepositionparticle since Used after a time duration to mean "for the past..." or "ever since"