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It was also originally used as the treble clef, and has gradually changed into the character represented in the margin. See Clef. G 1913 Webster] Gab (g, n. [Cf. Gaff.] (Steam Engine) The hook on the end of an eccentric rod opposite the strap. See. Illust. of Eccentric. 1913 Webster] Gab, n. [OE. gabbe gabble, mocking, fr. Icel. gabb mocking ...