This is the 7869th most frequent Japanese word.
四苦八苦
"四苦八苦" means going through great hardship or struggling desperately.
Used to describe the difficulty someone is experiencing in solving math problems.
彼は数学の宿題に四苦八苦している。
He is struggling intensely with his math homework.
Describes persistent effort and challenges faced in completing a report after much labor.
四苦八苦してやっとレポートを完成させた。
After much struggle, I finally completed the report.
Refers to the challenge and hard effort put into understanding a software's function.