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The Collaborative International Dictionary
quab

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

Wiktionary
quab

n. 1 An unfledged bird. 2 (context by extension English) Something immature or unfinished.