Definition
to position oneself so that one's lower body is supported by a seat or the ground
坐下
Before we start the meeting, please sit down.
在我們開始會議之前，請坐下。
She was exhausted and finally sat down on the sofa.
她非常疲憊，終於在沙發上坐了下來。
When the teacher entered the classroom, the students knew to sit down immediately.
當老師走進教室時，學生們知道要立刻坐下。