1. besiege To attack is to begin hostilities of any kind. A general invades a country by marching in troops; he attacks a city by drawing up an army against it; he assaults it by hurling his troops dire Synonyms: attack, assail, beset, combat, invade, assault, besiege, encounter, set upon, beleaguer, charge, fall upon, storm Antonyms: aid, cover, protect, shelter, support, uphold, befriend, defend, resist, shield, sustain, withstand