lag

/læg/

hang (back) or fall (behind) in movement, progress, development, etc.

中文释义：落后；延迟

The project began to lag behind schedule due to a lack of funding.

由于缺乏资金，该项目开始落后于计划。

Some students lag in reading comprehension compared to their peers.

一些学生在阅读理解方面落后于同龄人。