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breeze (n.): 1560s, "north or northeast wind," from Old Spanish briza "cold northeast wind;" in West Indies and Spanish Main, the sense shifting to "northeast trade wind," then "fresh wind from the sea." English sense of "gentle or light wind" is from 1620s. An alternative possibility is that the English word is from East Frisian brisen "to blow fresh and strong." The slang for "something easy" is American English, c. 1928.
main (n.): Old English mægen (n.) "power, bodily strength, force, efficacy," from Proto-Germanic *maginam "power," suffixed form of PIE root *magh- (1) "be able, have power" (see may (v.)). Original sense preserved in phrase with might and main. Meaning "principal channel in a utility system" is first recorded 1727 in main drain. Used since 1540s for "continuous stretch of land or water;" in nautical jargon used loosely for "the ocean," but in Spanish Main the word is short for mainland and refers to the coast between Panama and Orinoco (as contrasted to the islands of the West Indies).
Spanish (adj.): c. 1200, Spainisc, from Spaine "Spain," from Old French Espaigne (see Spaniard) + -ish. Replaced Old English Speonisc. Altered 16c. by influence of Latin. As a noun, "the Spanish language," from late 15c.

For Spanish Main see main. Spanish moss is attested from 1823. Spanish fly, the fabled aphrodisiac (ground-up cantharis blister-beetles), is attested from c. 1600. Spanish-American War was so called in British press speculations early 1898, even before it began in April. For Spanish Inquisition (by c. 1600), see Inquisition.