fall behind

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fall behind (third-person singular simple present falls behind, present participle falling behind, simple past fell behind, past participle fallen behind)

1. Used other than figuratively or idiomatically: see fall,‎ behind.
2. (idiomatic, intransitive) To be late (for a regular event)

   You're falling behind with the rent.

3. (intransitive) To be progressively below average in performance.

   You could lose your job if you keep falling behind with your work.

   It's not like John to fall behind in maths.

4. (transitive and intransitive) to fail to keep up (with)