"open wooden vessel," late 14c., from M.L.G., M.Du., or M.Flem. tubbe,
of uncertain origin. Related to O.H.G. zubar
"vessel with two handles, wine vessel," Ger. Zuber
. Considered to be unrelated to L. tubus
); one theory connects it to the root of two
based on the number of handles. Also 17c. slang for "pulpit;" hence tub-thumper
(1662) "speaker or preacher who thumps the pulpit for emphasis."