The Collaborative International Dictionary of English v.0.48:

Quob \Quob\ (kw[o^]b), v. i. [Cf. Quaver.] [Written also
   quop and quab.]
   To throb; to quiver. [Local & Vulgar]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Quab \Quab\, n. [Cf. D. kwab eelpout, Dan. quabbe, G. quabbe,
   quappe, LG. quabbe a fat lump of flesh, and L. capito a kind
   of fish with a large head, fr. caput the head, also E.
   squab.]
   An unfledged bird; hence, something immature or unfinished.
   --Ford.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Quab \Quab\, v. i.
   See Quob, v. i.
   [1913 Webster]