同学你好，该知识点来自沪江网校《实用韩国语高级【4月班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，
run down才是“精疲力竭的，疲憊不堪的，衰弱的”的意思
run up表示
1. [ C ]
In some sports, a run-up is a period or distance of running that you do in order to be going fast enough to perform a particular action
助跑；助跑距離
The longer and faster your run-up is, the higher you can jump.
你助跑的距離越長、速度越快，跳得就越高。

2. [ S ] mainly UK
the final period of time before an important event
（重大事情的）前奏，前期，準備階段
Everyone is very busy during the run-up to publication.
書出版前的最後準備階段，每個人都在緊張地忙碌著。

希望对你有帮助。