Meaning
suddenly appearing and suddenly vanishing — (figurative) One's movement or transformation being so unpredictable and mysterious that others cannot notice it, as if a ghost appears briefly and then vanishes.
Conjugations
신출귀몰해신출귀몰한신출귀몰하여신출귀몰하니신출귀몰합니다신출귀몰해요신출귀몰했어신출귀몰했어요신출귀몰했습니다