Cavy

·noun A rodent of the genera Cavia and Dolichotis, as the guinea pig (Cavia cobaya). Cavies are natives of South America.

Water cavy
·- The <<Capybara>>. ...

Webster's Dictionary of the English Language
havy cavy
Wavering, doubtful, shilly shally. ...

Dictionary of The Vulgar Tongue by Francis Grose
havy-cavy
undetermined, wavering, (HABE CAVE) doubtful whether to accept or reject a thing. Nottingham. ...

A glossary of provincial and local words used in England by Francis Grose