우르릉 + 울리다 / 소리가 나다; 우르릉 쾅쾅
rumbling (thunder)
Example
먹구름이 끼더니 천둥이 우르릉 울렸어요.
Dark clouds gathered, and then thunder rumbled.
Word parts
의성어 (sound word) for a deep, rolling rumble, like thunder or a heavy machine.
Good to know
Thunder in Korean picture books goes 우르릉 쾅쾅: the rumble, then the crack.
Related words