mod. written and sent with love and care. (The initialism is sometimes written on love letters. Also an acronym.) : I know they are sealed with a kiss, because she says so.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
SWAK
acronym for sealed with a kiss, attested from 1918; first ref. is to soldiers' letters home in World War I.