누워서 침 뱉기예요 · 누워서 침 뱉기나 마찬가지예요
an act that backfires on oneself, shooting oneself in the foot (lit. spitting while lying on one's back)
Example
밖에서 회사 욕을 하는 건 누워서 침 뱉기예요.
Badmouthing your own company to outsiders just backfires on you.
Word parts
If you spit upward while lying on your back, it falls right back onto your own face.
Good to know
Pronounced [누워서 침 밷끼]. Typically about criticizing your own family, team or company in public, which ends up shaming you. Don't mix it up with 누워서 떡 먹기 'a piece of cake'.