Vouch
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
To call upon; to call in to warranty; to call upon the grantor or warrantor to defend the title to an estate. To vouch is to call upon, rely on, or quote as an authority. Thus, in the old writers, to vouch a case or report ls to quote it as an authority.
Co. Litt. 70a.