| swale | (noun) a low area (especially a marshy area between ridges) | - |
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| swallow | (noun) the act of swallowing | Synonyms: deglutition, drink |
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| (noun) small long-winged songbird noted for swift graceful flight and the regularity of its migrations | - |
| (noun) a small amount of liquid food | Synonyms: sup |
| swallowtail | (noun) a man's full-dress jacket with two long tapering tails at the back | Synonyms: morning coat, swallow-tailed coat |
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| swallowwort | (noun) perennial herb with branched woody stock and bright yellow flowers | Synonyms: celandine, Chelidonium majus, greater celandine, swallow wort |
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| (noun) tropical herb having orange-red flowers followed by pods suggesting a swallow with outspread wings; a weed throughout the tropics | Synonyms: Asclepias curassavica, blood flower |