- 走下坡路 [zǒu xià pō lù]
- go downhill; be on the decline; take a bad turn; go from bad to worse
The team went into a nose dive after their captain was hurt, and they were badly beaten.
Some people started at the bottom and worked up; but some people used their money badly and started at the top only to work down.
He is over the hill as a professional athlete.