Definition of Excusable Assault
One committed by accident or misfortune in doing tiny lawful act by lawful means, with ordinary caution and without any unlawful intent. People v. O’Connor, 82 App.Div. 55, 81 N.Y.S. 555. See e.g. Self defense.
That's the definition of Excusable Assault in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.