Etymology
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buzz-saw (n.)
"circular saw," 1849, American English, from buzz (v.) + saw (n.). So called from the sound it makes when in operation.
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buzzword (n.)
also buzz word, 1946, from buzz (n.) + word (n.). Noted as Harvard student slang for the key words in a lecture or reading. Perhaps from the use of buzz in the popular counting game.
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BVDs (n.)
"men's underwear," 1935, from trademark name (dating to 1876) of manufacturer Bradley, Voorhees, and Day.
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bwana 
respectful or reverential form of address in East Africa, 1875, from Swahili.
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by (prep., adv.)

Old English be- (unstressed) or bi (stressed) "near, in, by, during, about," from Proto-Germanic *bi "around, about," in compounds often merely intensive (source also of Old Saxon and Old Frisian bi "by, near," Middle Dutch bie, Dutch bij, German bei "by, at, near," Gothic bi "about"), from PIE *bhi, reduced form of root *ambhi- "around."

As an adverb by c. 1300, "near, close at hand." OED (2nd ed. print) has 38 distinct definitions of it as a preposition. Originally an adverbial particle of place, which sense survives in place names (Whitby, Grimsby, etc., also compare rudesby). Elliptical use for "secondary course" was in Old English (opposed to main, as in byway, also compare by-blow "illegitimate child," 1590s, Middle English loteby "a concubine," from obsolete lote "to lurk, lie hidden"). This also is the sense of the second by in the phrase by the by (1610s). By the way literally means "along the way" (c. 1200), hence "in passing by," used figuratively to introduce a tangential observation ("incidentally") by 1540s.

To swear by something or someone is in Old English, perhaps originally "in the presence of." Phrase by and by (early 14c.) originally meant "one by one," with by apparently denoting succession; modern sense of "before long" is from 1520s. By and large "in all its length and breadth" (1660s) originally was nautical, "sailing to the wind and off it," hence "in one direction then another;" from nautical expression large wind, one that crosses the ship's line in a favorable direction.

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Byblos 
ancient Phoenician port (modern Jebeil, Lebanon) from which Egyptian papyrus was exported to Greece. The name probably is a Greek corruption of Phoenician Gebhal, said to mean literally "frontier town" or "mountain town" (compare Hebrew gebhul "frontier, boundary," Arabic jabal, Canaanite gubla "mountain"), which is perhaps a folk-etymology of the older Phoenician name, which might contain El "god." The Greek name also might have been influenced by, or come from, an Egyptian word for "papyrus."
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bye (interj.)
1709, shortened form of good-bye. Also compare lullaby. Reduplication bye-bye is recorded from 1736; as a sound used to lull a child to sleep it is attested from c. 1500.
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bye (n.)
in sporting use, a variant of by (prep). Originally in cricket, "a run scored on a ball that is missed by the wicket-keeper" (1746); later, in other sports, "position of one who is left without a competitor when the rest have drawn pairs" (1868).
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bygone (adj.)
"that has gone by, past," early 15c., from by (adv.) + gone. Compare similar construction of aforesaid. As a noun from 1560s (see bygones).
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bygones (n.)
"things that are past, what has gone by," especially offenses, 1560s, from plural of noun use of bygone (q.v.).
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