tie up 和tie down有什么区别？有点类似汉语的记上和记下，感觉好抽象啊

tie up 和tie down有什么区别？有点类似汉语的记上和记下，感觉好抽象啊

in certain way, these 2 terms are the same. Example: The robbers tied him up before robbing him. Or The robbers tied him down before robbing him.
Tie up and tie down all mean about the same thing: binding with a rope of something so to secure a person or something to a fixed position.
Even in the description of time: I got tied up with his problems. Or I got tied down with his problems.
However, there is a meaning difference in some expression:
You go and talked to him or do whatever you can to tie him up for 5 minutes in order for us to escape.
He looked after his little sister after their parents' untimely passing. In a way, she tied him down from realizing his dream.

tie up 绑好；缚牢；包扎；占用；阻碍；密切联系；合伙；停泊

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