v. (UN-2 3, 4.)
1839. F. A. Griffiths, Artill. Man., 185. [He] runs the carriage up and back, assists to hold on the fall, stoppers and unstoppers it.
1860. Family Economist, 7 Jan., 15/1. Unstoppering.—This operation is … likely to be required…, for the stoppers of decanters, smelling-bottles, &c. … frequently become fixed.
1879. Man. Artill. Exerc., 473. Stopper and shift the fall. Unstopper.
