It forms all or part of: apotheosis; atheism; atheous; Dorothy; enthusiasm; fair (n.) "a stated market in a town or city;" fanatic; ferial; feast; fedora; -fest; festal; festival; festive; festoon; Festus; fete; fiesta; henotheism; monotheism; pantheism; pantheon; polytheism; profane; profanity; Thea; -theism; theist; theo-; theocracy; theodicy; Theodore; Theodosia; theogony; theology; theophany; Theophilus; theosophy; theurgy; tiffany; Timothy.
It is the hypothetical source of/evidence for its existence is provided by: Greek theos "god;" Latin feriae "holidays," festus "festive," fanum "temple."
The decorative arts sense of "informal cluster (of flowers, etc.)" is by 1794. The colloquial sense of "promotional material" (from recording companies, etc.) was in use by 2001, perhaps as an extension of this sense. Swag also was English criminal's slang for "quantity of stolen property, loot" from c. 1839. This might be related to earlier senses of "round bag" (c. 1300) and "big, blustering fellow" (1580s), which may represent separate borrowings from the Scandinavian source. "The primary meaning was 'a bulging bag'" [Klein]. Swag lamp is attested from 1966.