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Drop off 放…下来
Could you please drop me off at the train station?
能在火车站放我下来吗？

Drop out 辍学
He dropped out of school when he was 3 because he has a rich dad.
他爸很有钱，所以他3岁的时候辍学了。

drop by 拜访，看望
I'll drop by later.
我一会来看你。

a drop in the ocean 杯水车薪
1000 is like a drop in the ocean in the stock market.
一千块在股市里就是杯水车薪。