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All answers having "Curb" as clue:

3 Character Answers:

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RHO

RIM



4 Character Answers:

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REIN



5 Character Answers:

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LEASH

LIMIT



6 Character Answers:

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ARREST

BRIDLE

REININ

STIFLE



8 Character Answers:

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RESTRAIN

RESTRICT



9 Character Answers:

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DETERRENT

RESTRAINT



10 Character Answers:

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DISCIPLINE

LIMITATION