to surround (as a fortified place) with armed forces for the purpose of capturing or preventing commerce and communicationbeleaguered the castle for months
beleaguered the castle for months
besiege, blockade, invest, leaguer(archaic)
barricade, block, cut off, dam, encircleassail, assault, attack, besetconfine, insulate, isolate, quarantine
lay siege to
emancipate, free, liberate, release, rescue
in 1587
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。