Answer: RAREFY

Possible questions:


Refine we know 6 Answers
Thin out we know 3 Answers
Make less dense we know 1 Answer
Attenuate we know 4 Answers
Make more subtle we know 1 Answer
Refine further we know 1 Answer
Make thin or porous we know 1 Answer
Make more refined we know 1 Answer
Lessen the density of we know 1 Answer
Become thinner, as air we know 1 Answer
Become less dense we know 1 Answer

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