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All answers having "Swallow" as clue:

3 Character Answers:

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EAT



4 Character Answers:

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BIRD

DOWN

GULP

SWIG



5 Character Answers:

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AVIAN

EATUP



6 Character Answers:

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ACCEPT

DIGEST

ENDURE

ENGULF

INGEST

MARTIN



7 Character Answers:

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BELIEVE

ENVELOP

FALLFOR

MARTLET



8 Character Answers:

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TOLERATE