Definition of Jibber

Babylon English Dictionary
(English) horse that jibs
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Jibber Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
A horse that jibs.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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jibber
\jib"ber\ (?), n. a horse that jibs. [eng.]

Everyday English and Slang in Ireland
person afraid to try new things