Third-person singular simple present indicative form of defeat.
The disastrous defeats of General Josiah Harmar (1753-1813) in October 1790 on the Miami river in Ohio, and of Governor Arthur St Clair on the 4th of November 1791 near Fort Recovery, Ohio, were followed in 1792 by the appointment of General Anthony Wayne to the command of the frontier.
But after the decisive defeats at Le Mans and Savenay, Cottereau retired again to his old haunts in the wood of Misdon, and resumed his old course of guerrilla warfare.
Defeats the purpose, doesn't it?
"I need nothing from you I cannot take when my father defeats your kingdom," he assured her.
When at the very height of power, all his schemes of aggrandisement came to sudden ruin through a succession of disastrous defeats at the hands of the Swiss at Grandson (March 2, 1476), at Morat (June 22, 1476) Austria.