易于反掌 yìyúfǎnzhǎng as easy as turning over a hand Origin Definitions Defs Strokes Stroke Words Sentences Sents 易于 易於 yìyú adjective easy to to be easy to; to be apt to; prone to; very likely to反掌 fǎnzhǎng to turn over one's hand to turn over the palm of one's hand; used as a metaphor for something that is extremely easy to do