besieger n an enemy who lays siege to your position n an energetic petitioner Usage(s) For 73 days the city that had never yet fallen to a besieger had fought off attack after attack. When they did, they often found that a determined besieger had got there before them. There should be a good sexual joke here -- the tireless besieger besieged, sacked and pillaged -- but the author won't let matters play that way.