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All answers having "Quit" as clue:

3 Character Answers:

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DIE

END

OPT

ORI



4 Character Answers:

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BAIL

FOLD

HALT

STOP



5 Character Answers:

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BAGIT

CEASE

DEMIT

LEAVE



6 Character Answers:

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CEASED

DESIST

EXITED

GAVEUP

GETOUT

GOTOUT

LOGOUT

PACKUP

RESIGN

SECEDE

STOPIT

VACATE



7 Character Answers:

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DROPOUT

ENSNARE

STOPPED



8 Character Answers:

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DESISTED

PACKITIN

RESIGNED

STEPDOWN



10 Character Answers:

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CHUCKITALL

STOPTRYING



15 Character Answers:

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CASHINONESCHIPS

LAYDOWNONESARMS

THREWINTHETOWEL

THROWINTHETOWEL