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To bulge or protrude outward. The spot on his head swelled out where he had been hit by the baseball. After the flooding, the walls in the basement began swelling out with excess moisture.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
to bulge outward; to expand outward. The sides of the box swelled out because it was too full. The west wall of the garage swelled out just before the building collapsed.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.