This is the 11441st most frequent Korean word.
꼬리를
"꼬리를" means "tail" (accusative form) in English.
Here, '꼬리를' is used as the object of the verb '흔들다' (to wag), referring to the tail of a specific cat.
고양이가 꼬리를 흔들어요.
The cat is wagging its tail.
In this sentence, '꼬리를' is used metaphorically to refer to the trace or end part of something, like a problem.
그는 문제의 꼬리를 잡았어요.
He caught the tail of the problem.
Here, '꼬리를' is again the object of the verb '물다' (to bite), referring to the tail of the puppy.