하룻강아지 범 무서운 줄 모른다더니 · 하룻강아지 범 무서운 줄 모르고
the inexperienced don't know what to fear; fools rush in (lit. a day-old puppy doesn't know to fear the tiger)
Example
하룻강아지 범 무서운 줄 모른다더니, 신입 사원이 부장님한테 대들었어요.
Fools rush in, as they say: a new employee talked back to the department head.
Word parts
하룻강아지 is a newborn puppy (하루 'one day' + 강아지 'puppy'); it is too new to the world to know that a tiger (범) is dangerous.
Good to know
Pronounced [하루깡아지]. Said of a newcomer who boldly takes on someone far stronger or more experienced, with a mix of disapproval and amusement. 범 is a native word for 호랑이.
Related words