bequeathyoudaoicibaDictYouDict[bequeath 词源字典]
bequeath: [OE] Etymologically, what you bequeath is what you ‘say’ you will leave someone in your will. The word comes from Old English becwethan, a derivative of cwethan ‘say’, whose past tense cwæth gives us quoth (it is no relation to quote, by the way). The original sense ‘say, utter’ died out in the 13th century, leaving the legal sense of ‘transferring by will’ (first recorded in 1066).

The noun derivative of Old English cwethan in compounds was -cwiss. Hence we can assume there was an Old English noun *becwiss, although none is recorded. The first we hear of it is at the beginning of the 14th century, when it had unaccountably had a t added to it, producing what we now know as bequest.
=> bequest, quoth[bequeath etymology, bequeath origin, 英语词源]
bequeath (v.)youdaoicibaDictYouDict
Old English becweðan "to say, speak to, exhort, blame," also "leave by will;" from be- + cweðan "to say," from Proto-Germanic *kwethan, from PIE *gwet- "to say, speak."

Original sense of "say, utter" died out 13c., leaving legal sense of "transfer by will." Closely related to bequest. "An old word kept alive in wills" [OED 1st ed.]. Old English bequeðere meant "interpreter, translator." Related: Bequeathed; bequeathing.