get behind
US /ɡet bɪˈhaɪnd/
UK /ɡet bɪˈhaɪnd/

1.
落後, 拖延
to fail to make enough progress or to be late with something
:
•
I've got behind with my work.
我的工作落後了。
•
If you miss a few classes, you'll soon get behind.
如果你缺了幾節課,你很快就會落後。
落後, 拖延
to fail to make enough progress or to be late with something