Princeton's WordNet

1. fall back(verb)

   fall backwards and down

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

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

3. fall back(verb)

   move back and away from

   "The enemy fell back"

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

   retreat

5. fall back, resort, recur(verb)

   have recourse to

   "The government resorted to rationing meat"

6. relapse, lapse, recidivate, regress, retrogress, fall back(verb)

   go back to bad behavior

   "Those who recidivate are often minor criminals"

Wiktionary

1. fall back(Verb)

   To retreat.

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