n. A member of a league; a confederate; one who belongs to a league of individuals or parties within a state: as, the French leaguers fought against both Henry III. and Henry IV.n. A camp; especially, the camp of a besieging army; a besieging force.n. Investment of a town or fort by an army; a siege or besiegement.To beleaguer; besiege.n. Association in a league; leagued or confederate action.n. A large cask; a tun; specifically (nautical), a cask for water holding 159 imperial gallons, carried on vessels before the introduction of water-tanks.