허허실실이 · 허허실실을
a battle of wits with feints and real attacks, mind games
Example
두 감독은 허허실실의 전략으로 맞섰습니다.
The two coaches faced off with strategies full of feints and real moves.
Word parts
허 empty+허 empty+실 solid+실 solid
Literally 'empty and solid' — hitting weak spots while hiding your own.
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