꼬리를

In a sentence

• 고양이가 꼬리를 흔들어요.

  The cat is wagging its tail.

  Here, '꼬리를' is used as the object of the verb '흔들다' (to wag), referring to the tail of a specific cat.

• 그는 문제의 꼬리를 잡았어요.

  He caught the tail of the problem.

  In this sentence, '꼬리를' is used metaphorically to refer to the trace or end part of something, like a problem.

• 강아지가 꼬리를 물었어요.

  The puppy bit its tail.

  Here, '꼬리를' is again the object of the verb '물다' (to bite), referring to the tail of the puppy.