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All answers having "Gives up" as clue:

5 Character Answers:

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BAILS

CAVES

CEDES

PUNTS

QUITS



6 Character Answers:

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RATSON

WAIVES

YIELDS



7 Character Answers:

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RESIGNS



8 Character Answers:

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ABANDONS

FORFEITS

RELEASES



9 Character Answers:

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LOSESHOPE

RENOUNCES



10 Character Answers:

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BREAKSWITH

CRIESUNCLE



15 Character Answers:

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WAVESAWHITEFLAG