Definition of "doat"

Ye all doat upon him, but he's not the Man you take him for.

1676, Aphra Behn, “The Town-Fop”, in The Works of Aphra Behn, Vol. III‎

I took any means to get access to you. O speak to me, Sophia! comfort my bleeding heart. Sure no one ever loved, ever doated like me.

1749, Henry Fielding, The History of Tom Jones, a Foundling, volumes (please specify |volume=I to VI), London: A[ndrew] Millar, […]

--And maun I still on Menie doat, And bear the scorn that's in her e'e?

1786, Robert Burns, “Song, Composed in Spring”, in Poems And Songs Of Robert Burns‎

“Is not she looking well?” said he, turning his eyes towards Jane. “Better than she ever used to do?—You see how my father and Mrs. Weston doat upon her.”

1815 December (indicated as 1816), [Jane Austen], chapter XVIII, in Emma: […], volume III, London: […] [Charles Roworth and James Moyes] for John Murray, page 346

We are so far advanced in the Arts and Sciences, that we live in retrospect, and doat on past atchievements[sic].

1825, William Hazlitt, “Mr. Coleridge”, in The Spirit of the Age […] , London: Printed for Henry Colburn, […]