obverse
Word family adverbobverselynounobversionadjectiveobverseverbobvert
ob·verse /ˈɒbvɜːs $ ˈɑːbvɜːrs/ noun [singular] 1 formalOPPOSITE/REVERSE the opposite of a particular situation or feeling 对立面;对应物 SYN oppositeobverse of The obverse of victory is defeat. 与胜利相对的是失败。
Origin obverse (1600-1700) Latin obversus, from obvertere “to turn toward”