noun

• Military action.
  "The Peloponnesian war is a proper subject for history, the siege of Athens for an epic poem, and the death of Alcibiades for a tragedy."
• Military action.
• Military action.
  "But once again Hodgson's men found a way to get the result they required and there is a real air of respectability about their campaign even though they had to survive a first-half siege from a Ukraine side desperate for the win they needed to progress."
• A seat.
  "Now Merlyn said kyng Arthur / goo thow and aspye me in al this land l knyghtes whiche ben of most prowesse & worship / within short tyme merlyn had founde suche knyȝtes[…]Thenne the Bisshop of Caunterbury was fette and he blessid the syeges with grete Royalte and deuoycyon / and there sette the viij and xx knyghtes in her syeges"

verb

• (transitive, uncommon) To assault or blockade a city or fortress with the intent of conquering by force or attrition; to besiege.