stopple

The heat will cause the oil to run down between the stopple and mouth.

From The New England Cook Book, or Young Housekeeper's Guide Being a Collection of the Most Valuable Receipts; Embracing all the Various Branches of Cookery, and Written in a Minute and Methodical Manner by Anonymous

When a glass stopple is set fast, in a bottle or decanter, rub a drop or two of olive oil round it, close to the mouth of the decanter, and place it near the fire.

From The Cook and Housekeeper's Complete and Universal Dictionary; Including a System of Modern Cookery, in all Its Various Branches, Adapted to the Use of Private Families by Eaton, Mary, fl. 1823-1849

There is not a crumb of sweet-cake in the house, and the stopple is so tight in the cider-barrel that I cannot stir it a peg.

From Giles Corey, Yeoman A Play by Freeman, Mary Eleanor Wilkins

"No, I did not feel any great alarm, sister," said Pierre, smiling, "since I could not but perceive that the decanter was still full to the stopple."

From Pierre; or The Ambiguities by Melville, Herman

Rub a drop or two of oil with a feather round the stopple, close to the mouth of the bottle or decanter, then place it between one and two feet from the fire.

From The New England Cook Book, or Young Housekeeper's Guide Being a Collection of the Most Valuable Receipts; Embracing all the Various Branches of Cookery, and Written in a Minute and Methodical Manner by Anonymous

Not one company responded, so she stoppled looking.

From New York Times ● Dec. 14, 2021

I produced from my pocket a little vial, containing matches, stoppled water-tight, and told him, that, though we were upset, we should still have some dry matches; at which he stared without saying a word.

From The Atlantic Monthly, Volume 02, No. 10, August, 1858 by Various