1888, "a scrimmage in rugby," abbreviation of scrummage, a variant form of scrimmage (n.). The transferred sense of "continued noisy throng" is by 1950.
"a great number regarded collectively; a crowd or throng; the characteristic of being many, numerousness," early 14c., from Old French multitude (12c.) and directly from Latin multitudinem (nominative multitudo) "a great number, a crowd; the crowd, the common people," from multus "many, much" (see multi-) + suffix -tudo (see -tude). Related: Multitudes.
A multitude, however great, may be in a space so large as to give each one ample room; a throng or a crowd is generally smaller than a multitude, but is gathered into a close body, a throng being a company that presses together or forward, and a crowd carrying the closeness to uncomfortable physical contact. [Century Dictionary]
c. 1300, presse, "a crowd, throng, company; crowding and jostling of a throng; a massing together," from Old French presse (n.) "a throng, a crush, a crowd; wine or cheese press" (11c.), from Latin pressare (see press (v.1)). Late Old English had press in the sense of "clothes press," but the Middle English word probably is from French.
The general sense of "instrument or machine by which anything is subjected to pressure" is from late 14c.: "device for pressing cloth," also "device to squeeze juice from grapes, oil from olives, cider from apples, etc." The sense of "urgency, urgent demands of affairs" is from 1640s. Weightlifting sense is from 1908. The basketball defense so called from 1959 (in full-court press).
The specific sense "machine for printing" is from 1530s; this was extended to publishing houses and agencies of producing printed matter collectively by 1570s and to publishing generally (in phrases such as freedom of the press) from c. 1680. This gradually shifted c. 1800-1820 to "the sum total of periodical publishing, newspapers, journalism." The press, meaning "journalists collectively" is attested from 1921 (though superseded by media since the rise of television, etc.).
Press agent, employed to tend to newspaper advertisements and supply news editors with information, is from 1873, originally theatrical; press conference "meeting at which journalists are given the opportunity to question a politician, celebrity, etc.," is attested from 1931, though the thing itself dates to at least World War I. Press secretary is recorded from 1940; press release "official statement offered to a newspaper for publication" is by 1918.
Via the sense "crowd, throng," Middle English in press meant "in public," a coincidental parallel to the modern phrase in the press.
late 14c. (c. 1200 as a surname), "riotous merry-making," also an occasion of this, from Old French revel, resvel "entertainment, revelry," verbal noun from reveler, also rebeller (14c.) "be disorderly, make merry" (see rebel (adj.)). "The development of sense in OF. is 'rebellion, tumult, disturbance, noisy mirth'" [OED].
Formerly especially a kind of dance or performance given in connection with masks or pageants, a dancing procession (usually revels). Related: revel-rout "riotous throng."