졸아요 · 졸았어요 · 졸 거예요 · 조는 (+noun) (ㄹ drops)
to doze (off), to nod off
Example
수업 시간에 졸다가 선생님께 혼났어요.
I dozed off in class and got scolded by the teacher.
Word parts
The root of 졸리다 (sleepy) and 졸음 (drowsiness).
Good to know
Homonym: 졸다 also means 'to boil down,' as when soup reduces on the stove.