swallow has 13 distinct synonyms spread across 6 of its 11 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
engulf and destroy
“The Nazis swallowed the Baltic countries”
enclose or envelop completely, as if by swallowing
“The huge waves swallowed the small boat and it sank shortly thereafter”
utter indistinctly
“She swallowed the last words of her speech”
keep from expressing
“I swallowed my anger and kept quiet”
believe or accept without questioning or challenge
“Am I supposed to swallow that story?”
Synonyms, antonyms and the broader and narrower relations for swallow come from Princeton University’s WordNet. Full sources and licences.
small long-winged songbird noted for swift graceful flight and the regularity of its migrations