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All answers having "Discourage." as clue:

4 Character Answers:

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DAMP



5 Character Answers:

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BRIEF

CHILL

CONGA

DAUNT

DETER

RABBI

REPEL

SINEW



6 Character Answers:

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COCCYX

PUTOFF

SADDEN

STITCH



7 Character Answers:

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DEPRESS



8 Character Answers:

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ROCKSALT



9 Character Answers:

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ASSAILANT



10 Character Answers:

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WETBLANKET



15 Character Answers:

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POURCOLDWATERON