Beg
Middle English: probably from Old English bedecian, of Germanic origin; related to bid2.
wiktionary
From Middle English beggen, assimilation from Old English *becgan, *bedcan, *bedican, syncopated variants of bedecian(“to beg”), perhaps from Proto-Germanic *bedagô(“petitioner; requestor; beggar”), from *bedą, *bedō(“prayer; request”). Related to North Frisian bēdagi(“to pray”), Gothic 𐌱𐌹𐌳𐌰𐌲𐍅𐌰( bidagwa, “beggar”), Old English biddan(“to ask”). More at bid, bead. See Norwegian Bokmål be(“beg, ask”).
From Ottoman Turkish بك (beg).
beg
etymonline
beg (v.)
"to ask alms," especially to do so habitually as one's way of life, c. 1200, of uncertain origin. Perhaps from the rare Old English bedecian "to beg," from Proto-Germanic *beth-. Or from Anglo-French begger, a back-formation from Old French noun begart (see beggar (n.)) and ultimately from Beguine, which OED considers "perhaps the most likely derivation." The Old English word for "beg" was wædlian, from wædl "poverty." Related: Begged; begging.
Meaning "ask for" (a favor, etc.) is by 1520s. As a courteous mode of asking (beg pardon, etc.), attested by c. 1600. Of dogs, 1762. To beg the question (1580s) translates Latin petitio principii, and means "to assume something that hasn't been proven as a basis of one's argument," thus "asking" one's opponent to give something unearned, though more of the nature of taking it for granted without warrant. To beg off (something) "obtain release from by entreaty" is from 1741.
