besieging be·sie·ging US/bɪˈsidʒɪŋ/ uncommon noun 1. the action of an armed force that surrounds a fortified place and isolates it while continuing to attack Synonymssiegebeleagueringmilitary blockade Related words Broader terms blockade Narrower terms AlamoAtlantaBataanDien Bien PhuLucknowOrleansPetersburgPlevna WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.