stronghold

Root √בצר: בָּצַר vb cut off make inaccessible enclose Qal cut off grape-gathering -gatherer cut off , grape-clusters; hence,; fig.(= take away) Niph be withheld . Pi fortify . (esp. by fortifying),

בִּצָּרוֹן לְב׳ n.[m.] stronghold Zc 9:12 .