Definition of "vouchsafe"

If Brutus will vouchſafe that Antony / May ſafely come to him ...

1599?, William Shakespeare, Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies, London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, Julius Caesar, Act III, scene i, page 119

Wilt thou, whoſe will is large and ſpacious, / Not once vouchſafe to hide my will in thine?

1609, William Shakespeare, Shake-speares sonnets: Neuer before Imprinted‎, London: G[eorge] Eld for T[homas] T[horpe], and are to be solde by William Aspley, sonnet 135

Needless to say, we have been vouchsafed no idea of what this might cost the innocent victims, the ratepayers.

1964 July, “The mythology of monorails”, in Modern Railways, page 57

Nancy's lips parted abruptly, as if there were angry words all ready to come; but her eyes, resting on Pollyanna's jubilantly trustful face, saw something that prevented the words being spoken."Humph!" she vouchsafed. Then, showing her old-time interest, she went on: "But, say, it is queer, his speakin' to you, honestly, Miss Pollyanna. He don't speak ter no one; and he lives all alone in a great big lovely house all full of jest grand things, they say. Some says he's crazy, and some jest cross; and some says he's got a skeleton in his closet."

1913, Eleanor H. Porter, chapter 8, in Pollyanna‎, L.C. Page

His predictions were at first to be guided by direct intimations vouchsafed to him by the god; […]

1879, F. D. Morice, Pindar, chapter 8, page 129