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All answers having "Stop working" as clue:

3 Character Answers:

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DIE



4 Character Answers:

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REST



5 Character Answers:

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ACTUP

RELAX

SEIZE



6 Character Answers:

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PACKUP

RETIRE



7 Character Answers:

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CRAPOUT

GOKAPUT

SEIZEUP



8 Character Answers:

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PUNCHOUT



10 Character Answers:

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CALLITADAY

TAKEABREAK