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All answers having "Weigh down" as clue:

3 Character Answers:

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BOG

TAX



4 Character Answers:

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LADE

LOAD



5 Character Answers:

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PRESS



6 Character Answers:

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BURDEN



7 Character Answers:

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DEPRESS

OPPRESS



8 Character Answers:

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ENCUMBER

OVERLOAD



10 Character Answers:

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OVERBURDEN