expugn (v.)

early 15c., "eradicate, exterminate," also "conquer, capture by fighting," from Old French expugner, from Latin expugnare "to take by assault, storm, capture" (source also of Spanish expugnar, Italian espugnare), from ex (see ex-) + pugnare "to fight" (see pugnacious). Related: Expugned; expugnable.