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All answers having "Fall back" as clue:

3 Character Answers:

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EBB

LAG



4 Character Answers:

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REEL

WANE



5 Character Answers:

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LAPSE



6 Character Answers:

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RECEDE

RETIRE

REVERT



7 Character Answers:

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REGRESS

RELAPSE

RETREAT



10 Character Answers:

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RECIDIVATE