以后 yǐhòu HSK2 after Definitions Defs Origin Strokes Stroke Words Sentences Sents 以 yǐ preposition [positional boundary] (bound form) used before words of location or time to indicate a boundary, such as 以后 yǐhòu or 以上 yǐshàng后 後 hòu locativepreposition after (bound form) later in time; afterwards; future; subsequent in a sequence