Expugn \Ex*pugn"\ ([e^]ks*p[=u]n"), v. t. [L. expugnare; ex out + pugnare to fight, pugna fight. Cf. {Impugn}.] To take by assault; to storm; to overcome; to vanquish; as, to expugn cities; to expugn a person by arguments. [1913 Webster]