This is the 4187th most frequent Japanese word.
不振
Lack of success; poor performance.
Here, 不振 (fushin) is used to describe the underperformance in results or achievements.
彼の業績は最近不振に陥った。
His performance has recently declined.
In this sentence, 不振 is applied to illustrate a downturn or lack of success in sales.
その会社の売上が不振に悩んでいる。
The company is struggling with a sales slump.
This usage of 不振 indicates a decline in performance, specifically in the context of a team.