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All answers having "Decrease" as clue:

3 Character Answers:

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DIP

EBB

GOD

RHO



4 Character Answers:

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BATE

DROP

IRON

PARE

WANE



5 Character Answers:

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ABATE

ERODE

LOWER

PRESS

REMIT



6 Character Answers:

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LESSEN

REDUCE

SHRINK



7 Character Answers:

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DECLINE

DWINDLE

FALLOFF

LIGHTEN



8 Character Answers:

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DOWNTURN

TAPEROFF



9 Character Answers:

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REDUCTION



10 Character Answers:

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DIMINUTION



13 Character Answers:

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CUTDOWNTOSIZE