tsur denotes surrounding a city in siege, and in a smaller group of contexts restricting or guarding someone or something.

The dominant attested use describes forces surrounding and pressing a city in siege. A smaller set applies the verb to confinement or guarding, whether directed against a person, a city, or an object.

1. Besiege a city or people · dominant

   The Qal forms repeatedly occur with armies advancing against named cities: in 2 Samuel 20:15 the attackers besiege Abel of Beth-maacah, build a siege mound, and batter its wall; in 2 Kings 16:5 the opposing kings besiege Ahaz at Jerusalem. Participles likewise identify forces already surrounding a place, as in Jeremiah 37:5, where the Chaldeans besieging Jerusalem withdraw.

   2 Samuel 20:152 Kings 16:52 Kings 17:51 Kings 20:1Jeremiah 37:5Deuteronomy 20:19
2. Confine or guard within bounds · occasional

   In 2 Chronicles 28:20 the Hiphil sequential imperfect has Tiglath-pileser confining him rather than strengthening him. Psalm 139:5 addresses a second-person subject as confined behind and before, while Song of Songs 8:9 uses a first-person plural Qal imperfect in the clause about guarding a door with a cedar plank.

   2 Chronicles 28:20Psalm 139:5Song of Songs 8:9Isaiah 29:3Ezekiel 4:3

In the Anselm Project Bible: Across the military contexts, the APB commonly renders the clause with "besieged" or "laid siege." In other settings it uses "confined" and "guard"; These renderings show the verse contexts rather than fixed one-for-one equivalents.