HSK 7–9 · verb · Practice
退步
to fall behind; to decline; to regress
这学期他的成绩退步了。
Zhè xuéqī tā de chéngjì tuìbùle。
His grades went down this semester.
多练习就会进步，反之，不练就会退步。
Duō liànxí jiù huì jìnbù， fǎnzhī， bú liàn jiù huì tuìbù。
Practice more and you'll improve; conversely, if you don't practice, you'll fall behind.