c. 1300, shouten, schowten "to call or cry out loudly," a word of unknown origin; perhaps from the root of shoot (v.) on the notion of "throw the voice out loudly," or related to Old Norse skuta "a taunt" (compare scout (v.2)); both of which are reconstructed to be from PIE root *skeud- "to shoot, chase, throw."
The transitive sense of "utter in a loud and vehement voice" is by late 14c. Related: Shouted; shouting. To be all over but the shouting when the outcome appears certain is by 1842.
late 14c., from Old French jubilacion "jubilation, rejoicing," and directly from Late Latin iubilationem (nominative iubilatio) "a shouting for joy," noun of action from past-participle stem of iubilare "to let out whoops, shout for joy" (see jubilant).
late 14c., "roaring, shouting;" 1590s, "wailing, weeping," present-participle adjective from cry (v.). Sense of "demanding attention or remedy" is from c. 1600. U.S. colloquial expression of disgust, impatience, etc., for crying out loud, is by 1921, probably a euphemism for for Christ's sake.
1540s, "act of shouting or applauding in approval," from Latin acclamationem (nominative acclamatio) "a calling, exclamation, shout of approval," noun of action from past-participle stem of acclamare "to call to, cry out at, shout approval or disapproval of," from assimilated form of ad "to, toward" (see ad-) + clamare "cry out" (from PIE root *kele- (2) "to shout"). As a method of spontaneous approval of resolutions, etc., by unanimous voice vote, by 1801, probably from the French Revolution.
1580s, "to investigate, examine," a back-formation from exploration, or else from French explorer (16c.), from Latin explorare "investigate, search out, examine, explore," said to be originally a hunters' term meaning "set up a loud cry," from ex "out" (see ex-) + plorare "to weep, cry." Compare deplore. De Vaan notes modern sources that consider "the ancient explanation, ... that the verb explorare originally meant 'to scout the hunting area for game by means of shouting'" to be "not unlikely." Second element also is explained as "to make to flow," from pluere "to flow." Meaning "to go to a country or place in quest of discoveries" is first attested 1610s. Related: Explored; exploring.