c.1225, perhaps from O.E.
bedecian "to beg," from P.Gmc.
*beth-; or possibly from Anglo-Fr.
begger, from O.Fr.
begart (see
beg). The O.E. word for "beggar" was
wædla. Of trained dogs, 1816. As a courteous mode of asking (
beg pardon, etc.), first attested 1600. To
beg the question translates L.
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.