시치미가 · 시치미를
feigned ignorance, playing dumb (in 시치미를 떼다)
Example
그는 자기가 한 일인데도 모른다고 시치미를 뗐어요.
Even though he did it himself, he played dumb and said he didn't know.
Word parts
Originally a name tag tied to a hunting hawk; removing it hid who owned the bird.
Good to know
Almost always used in the idiom 시치미를 떼다 (casually 시치미 떼다), 'to play dumb.'