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"to move heavily or unsteadily," 1520s, probably from Old Norse sveggja "to swing, sway," cognate with Old English swingan "to swing" (see swing). Related: Swagged; swagging.
"ornamental festoon," 1794, from swag (v.). Colloquial sense of "promotional material" (from recording companies, etc.) was in use by 2001; swag was English criminal's slang for "quantity of stolen property, loot" from c.1839. Earlier senses of "bulky bag" (c.1300) and "big, blustering fellow" (1580s) may represent separate borrowings from the Scandinavian source. Swag lamp attested from 1966.
[probably fr the swag, ''sack,'' in which loot might be carried]
Scientific (or Silly) Wild Ass Guess. A term used by technical teams when establishing high level sizings for large projects.
in architecture and decoration, carved ornamental motif consisting of stylized flowers, fruit, foliage, and cloth, tied together with ribbons that sag in the middle and are attached at both ends. The distinction is sometimes made between a swag and a festoon by limiting the former to festoons entirely made up of folds of cloth.