Or matsuwr {maw-tsoor'}; from tsuwr; something hemming in, i.e. (objectively) a mound (of besiegers), (abstractly) a siege, (figuratively) distress; or (subjectively) a fastness -- besieged, bulwark, defence, fenced, fortress, siege, strong (hold), tower.
see HEBREW tsuwr
H4692. matsor
or matsur מָצוֺר noun [masculine] siege-enclosure, siege, entrenchment; — always ׳מ absolute, except construct מְצוֺר Ezekiel 4:7 suffix מְצוּרֶ֑ךָ 4:8; —
1 siege ׳מ עָלֵינוּ שָׂם Micah 4:14 he hath laid siege to us, compare מ עָלֶיהָ ׳וְנָתַתָּ֫ Ezekiel 4:2; בַמּ ׳בּוֺא is come into a state of siege Deuteronomy 20:19; 2 Kings 24:10; 25:2; Jeremiah 52:5, compare בַמּ ׳וְהָֽיְתָה Ezekiel 4:3; בַּמּ ׳יוֺשֶׁבֶת֯י Jeremiah 10:17; יְרו ׳מְצוֺר Ezekiel 4:7 siege of Jerusalem, but also ׳עַליְֿרו׳מ Zechariah 12:2; מ ׳יְמֵי of duration of siege Ezekiel 4:8; 5:2; מ ׳מֵי Nahum 3:14 water for a siege; in phrase ׳בְּמ וּבְמָצוֺק in the siege and stress Deuteronomy 28:53, 55, 57; Jeremiah 19:9.
2 enclosure, i.e. siege-works Deuteronomy 20:20; late = ram-part Zechariah 9:3, מ ׳עִיר entrenched city Psalm 31:22 (al. besieged), 60:11 ("" 108:11 ׳ע מִבְצָר), compare 2 Chronicles 8:5; לְמ ׳עָרִים11:5, בְּמ ׳ישְׁבִים בִּירוּשָׁלַם32:10; ׳מ Habakkuk 2:1 according to most ("" מִשְׁמֶרֶת); but We derives from נצר, i.e. watch-tower, Now conjectures מִצְמֶּה (compare וַאֲצַמֶּה following); > Buhl conjectures ׳מ ֯׃מְצָד
proper name, of a territory.