PUBLIC MARKS from tadeufilippini with tags etimologia & etymonline

muscle Look up muscle at Dictionary.com 1533, from L. musculus "a muscle," lit. "little mouse," dim. of mus "mouse" (see mouse). So called because the shape and movement of some muscles (notably biceps) were thought to resemble mice. The analogy was made in Gk., too, where mys is both "mouse" and "muscle," and its comb. form gives the medical prefix my-/myo-. Cf. also O.C.S. mysi "mouse," mysica "arm;" Ger. Maus "mouse, muscle," Arabic 'adalah "muscle," 'adal "field mouse." Fig. sense of "force, violence, threat of violence" is 1930, Amer.Eng. The verb first recorded 1913, "to accomplish by strength;" to muscle in is 1929 in underworld slang. Muscle-man was originally (1929) "an underworld enforcer;" sense of "strong man" first attested 1952. Muscle-bound is first recorded 1879. Muscle car "hot rod" is from 1969. Muscular Christianity (1857) is originally in ref. to philosophy of Anglican clergyman and novelist Charles Kingsley (1819-75).

omnibus Look up omnibus at Dictionary.com 1829, "four-wheeled public vehicle with seats for passengers," from Fr. (voiture) omnibus "(carriage) for all, common (conveyance)," from L. omnibus "for all," dat. pl. of omnis "all" (see omni-). Introduced by Laffitte in Paris, 1820. In ref. to legislation, the word is recorded from 1842. Meaning "man or boy who assists a waiter at a restaurant" is attested from 1888 (cf. busboy). bus Look up bus at Dictionary.com 1832, abbreviation of omnibus (q.v.). The Eng. word is simply a Latin dative plural ending. The verb meaning "transport students to integrate schools" is first recorded 1961. Verb meaning "clear tables in a restaurant" is first attested 1913, probably from the four-wheeled cart used to carry dishes. To miss the bus, in the fig. sense, is from 1915. Busman's holiday "leisure time spent doing what one does for a living" (1893) is probably a reference to London bus drivers riding the buses on their days off.