Princeton's WordNet

1. fall back, lose, drop off, fall behind, recede(verb)

   retreat

2. lag, dawdle, fall back, fall behind(verb)

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

Kernerman English Learner's Dictionary

1. fall behind(verb)ɔl

   to do worse than others in the same group

   He's falling behind his class in reading.

2. fall behindɔl

   to get behind others who are moving faster

   The injured soldiers fell behind their comrades.

Wiktionary

1. fall behind(Verb)

   To be late (for a regular event)

2. fall behind(Verb)

   To be progressively below average in performance.

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