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To increase in size or volume as a result of internal pressure; expand.
(verb-intransitive)
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To increase in force, size, number, or degree: Membership in the club swelled.
(verb-intransitive)
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To grow in loudness or intensity: "The din in front swelled to a tremendous chorus” ( Stephen Crane).
(verb-intransitive)
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To bulge out, as a sail.
(verb-intransitive)
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To rise or extend above the surrounding level, as clouds.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.