fall behind

• • 落后于，跟不上，被超过，被甩在后面：

    He didn't want to fall behind in his studies.

    他不想在学习上落后于别人。

    Soon he fell behind in the race.

    很快他在赛跑中落在了后面。

  • 拖欠(债务等)；没有按时完成(或履行)任务(常与with连用)：

    If you fall behind with the rent,you will be asked to leave.

    你要是拖欠房租，叫你立即走人。

    I've fallen behind with my correspondence.

    我积压了许多信件未作答复。

  • (水平、质量等)下降：

    The student's work has been falling behind recently.

    近来，这个学生的作业质量一直在下降。

  • 落在(…)后面