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thwick-thwack

thwick-thwack Obs.
  [Redupl. f. thwack.]
  The repetition or exchange of thwacks.

1575 R. B. Appius & Virg. B ij b, With thwicke thwack, with thump thump, With bobbing and bum. 1582 Stanyhurst Conceits in æneis, etc. (Arb.) 138 With peale meale ramping, with thwick thwack sturdelye thundring. 1611 Cotgr. s.v. Torche, Torche lorgue, words, like our thwicke thwacke, expressing a liberall and free dole of blowes. 1670 Ray Prov. 53 When a couple are newly married, the first moneth is honey-moon or smick smack: the second is, hither and thither: the third is, thwick thwack. 1783 Ainsworth Lat. Dict. (Morell) i. s.v. Thwack, To lay on thwick, thwack, ictus geminare.

Oxford English Dictionary

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