rare. [f. prec. + -ER1.]
1. One who or that which thwacks; a beater; spec. an implement for beating half-dried pantiles into shape on the thwacking-frame.
1867. Ure, Dict. Arts, etc., III. 902. When half-dry the tiles are taken out one by one placed on the thwacking frame, and beaten with the thwacker to produce the required shape.
1877. Knight, Dict. Mech., Thwacking-frame, the tool by which the upper side [of half-dried pantiles] is beaten has the shape of the segment of a cylinder, and is called the thwacker.
1879. G. Meredith, Egoist, Prelude. Like cudgels of carpet-thwackers expelling dust.
† 2. A thumper, a whacker; in quot., a thumping lie. Obs. rare1.
1674. N. Fairfax, Bulk & Selv., 108. It would follow, that our leasting were greater than somewhat else, or greater than it self; Which would be a thwacker.