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All answers having "Break down" as clue:

3 Character Answers:

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CRY

DIE

RHO

ROT

SOB



4 Character Answers:

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BAWL

SNAP

WAIL

WEEP



5 Character Answers:

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DECAY

PARSE



6 Character Answers:

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ANALYE

FACTOR



7 Character Answers:

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ANALYSE

ANALYZE

CRACKUP

DISSECT

GOKAPUT



9 Character Answers:

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DECOMPOSE

DISMANTLE



10 Character Answers:

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BIODEGRADE

GOTOPIECES



11 Character Answers:

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DECONSTRUCT



12 Character Answers:

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SLICEANDDICE



13 Character Answers:

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WEEPINANGUISH



14 Character Answers:

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BURSTINTOTEARS



15 Character Answers:

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CHEMICALLYDECAY