Webster's Revised Unabridged Dictionary · 1913

Gab

Gab (gab) , noun

[Compare Gaff.]

(Steam Engine) The hook on the end of an eccentric rod opposite the strap. See. Illust. of Eccentric.

Gab , noun

[Old English gabbe gabble, mocking, from Icelandic gabb mocking, mockery, or Old French gab, gabe; perh. akin to English gape, or gob. Compare Gab, v. i., Gibber.]

The mouth; hence, idle prate; chatter; unmeaning talk; loquaciousness. [Colloquial]
Collocations (1)
Gift of gab , facility of expression. [Colloquial]

Gab , intransitive verb

[Old English gabben to jest, lie, mock, deceive, from Icelandic gabba to mock, or Old French gaber. See 2d Gab, and compare Gabble.]

1.
To deceive; to lie. [Obsolete] — Chaucer
2.
To talk idly; to prate; to chatter. — Holinshed