Definition of "agog"

Cotton Mather came galloping downAll the way to Newbury town,With his eyes agog and his ears set wide,And his marvellous inkhorn at his side;

1860, John Greenleaf Whittier, “The Two-Headed Snake of Newbury”, in Home Ballads

. . and did not move even when the frogs crept out of the water and listened, with their gold-rimmed eyes all agog, and their yellow throats palpitating.

1894, Ford Madox Ford, The queen who flew: a fairy tale, page 41

People leaning forward, their lips parted a little, their eyes agog, staring at her, Elinor, with a horrible ghoulish excitement . .

1940, Agatha Christie, Sad Cypress, page 9

Joe shook his head in awe, eyes agog and mouth hanging open as mine once must have hung for the tales of the north woods' legendary denizens.

1964, Ken Kesey, Sometimes a Great Notion, page 190

Whenever they managed to steal a peak at what he was doing, the other girls were agog that he loved me so much.

2000, Charles Baxter, chapter 3, in The Feast of Love, page 29