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All answers having "Gimme a break!" as clue:

4 Character Answers:

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CMON

GEEZ

JEEZ



5 Character Answers:

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AWMAN

OHMAN

YEESH



6 Character Answers:

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OHSTOP

SHEESH



8 Character Answers:

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OHPLEASE

PUHLEASE

PUHLEEZE



10 Character Answers:

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LETSBEFAIR



12 Character Answers:

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FORPETESSAKE