坐下用英语是sit down。
sit down 英[sit daun] 美[sit daʊn]
down:（坐、倒、躺）下；向下；（表示范围或顺序的限度）下至
Can I sit down?我能坐下来吗？
sit down[例句]：
Have you both sat down and worked out a budget together?
你们有没有同心协力制订出一份预算呢？
Now sit down and make yourself comfortable. You must be very tired.
现在坐下来，让自己舒服些，你一定很累了。
Hughes beckoned him to sit down on a sofa.
休斯示意他坐在沙发上。
My leg still aches when I sit down
坐下时我的腿还会痛。
Just as we were ready to sit down to dinner, a little boy came running in.
正当我们要吃晚餐的时候，一个小男孩跑着进来了。
参考资料：百度百科-DOWN
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