易如反掌

easy as a hand's turn (idiom); very easy / no effort at all

easy / amiable / to change / to exchange / prefix corresponding to the English adjective suffix "-able" or "-ible" / abbr. for 易經|易经[Yi4 jing1], the Book of Changes

as / as if / such as

contrary / in reverse / inside out or upside down / to reverse / to return / to oppose / opposite / against / anti- / to rebel / to use analogy / instead / abbr. for 反切[fan3 qie4] phonetic system

lit. to turn over one's palm / fig. everything is going very well.

palm of the hand / sole of the foot / paw / horseshoe / to slap / to hold in one's hand / to wield