GNU Collaborative International Dictionary of English

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1.       
   Twang (?), v. i. [imp. & p. p. Twanged (?); p. pr. & vb. n. Twanging.] [Of imitative origin; cf. Tang a sharp sound, Tinkle.] To sound with a quick, harsh noise; to make the sound of a tense string pulled and suddenly let go; as, “the bowstring twanged”.
   
   [1913 Webster]