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All answers having "Abandon" as clue:

3 Character Answers:

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BAG



4 Character Answers:

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CEDE

DROP

FLEE

JILT

QUIT

SHED



5 Character Answers:

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DITCH

FORCE

LEAVE

SCRAP

SCRUB

WAIVE



6 Character Answers:

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DAGGER

DESERT

GIVEUP

MAROON

QUITON

VACATE



7 Character Answers:

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CALLOFF

FORSAKE

LECTERN

OMINOUS

SCUTTLE

SKIPOUT



8 Character Answers:

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GIVEOVER

ISOLATED

RENOUNCE

RUNOUTON

SPRINTER

XGOODBYE



9 Character Answers:

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CASTASIDE



11 Character Answers:

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KISSGOODBYE



15 Character Answers:

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LEAVEHIGHANDDRY

LEAVEINTHELURCH