Buy
Old English bycgan, of Germanic origin.
wiktionary
From Middle English bien, biggen, buggen, from Old English bycġan(“to buy, pay for, acquire, redeem, ransom, procure, get done, sell”), from Proto-West Germanic *buggjan, from Proto-Germanic *bugjaną(“to buy”), of uncertain origin. Perhaps from Proto-Indo-European *bʰūgʰ-(“to bend”), or from Proto-Indo-European *bʰeugʰ-(“to take away, deliver”).
Cognate with Scots by(“to buy, purchase”), obsolete Dutch beugen(“to buy”), Old Saxon buggian, buggean(“to buy”), Old Norse byggja(“to procure a wife, lend at interest, let out”), Gothic 𐌱𐌿𐌲𐌾𐌰𐌽( bugjan, “to buy”). The spelling with “u” is from the Southwest, while the pronunciation with /aɪ/ is from the East Midlands.
etymonline
buy (v.)
Old English bycgan (past tense bohte) "get by paying for, acquire the possession of in exchange for something of like value; redeem, ransom; procure; get done," from Proto-Germanic *bugjan (source also of Old Saxon buggjan, Old Norse byggja, Gothic bugjan), which is of unknown origin and not found outside Germanic.
The surviving spelling is southwest England dialect; the word was generally pronounced in Old English and Middle English with a -dg- sound as "budge," or "bidge." Meaning "believe, accept as true" is attested by 1926. Related: Bought; buying. To buy time "prevent further deterioration but make no improvement" is attested from 1946.
buy (n.)
"a purchase," especially a worthwhile one, 1875, American English, from buy (v.).
