gab

noun3

1. •
   Idle chatter.
2. •
   The mouth or gob.
3. •
   One of the open-forked ends of rods controlling reversing in early steam engines.

   • Loose eccentric reversing gear gave way about 1836 to the early forms of gab motion. [...] In 1840 Stephenson evolved a motion in which the gabs were connected directly to the valve spindle. — 1940

verb3

1. •
   To talk or chatter a lot, usually on trivial subjects.

   • "That Mrs. Mender gives a bloke the ear-ache; thinks a bloke's got all day to waste listening to her gab." — 1938
2. •
   (no longer used) To jest; to tell lies in jest; exaggerate; lie.

   • He would chant his own doughty deeds, and “gab,” as the Norman word was, in painful earnest, while they gabbed only in sport, and outvied each other in impossible fanfaronades” — 1866
3. •
   (no longer used) To speak or tell falsely.

noun1

1. •
   Initialism of gender-atypical behavior.