shut up: 闭嘴
Some of them need to buck up, and some of them need to shut up.
或许他们中的某些人应该给自己充充电，而有些人应该闭上嘴。

on par with: 与…相提并论
I don't think his ability is on a par with yours.
我认为他的能力不能与你的能力相媲美。
The elegance of the cabinets is on par with the value of the books.
书柜的典雅可与书籍的珍贵堪比。

walk out on: 抛弃，离开
Do you want to walk with me and live, or walk out on me and die?
你是想和我一起走并生存, 还是走出去死?
You walked out on me.
别忘了你把我甩了！