to fall behind
[phrase form: fall]
01
落后, 跟不上
to fail to keep up in work, studies, or performance
Intransitive
Transitive: to fall behind a competitor
例子
He began to fall behind in class after missing several lessons.
在错过几节课后，他开始在课堂上落后。
02
拖欠付款, 积累债务
to owe money due to not paying when required
Intransitive
例子
I 'm starting to fall behind on credit card bills.
我开始在信用卡账单上落后了。
