Locked with a lock and bolt
Kept shut and secured; locked tight.
("And Saul was told that David had come to Keilah, and Saul said, 'God has delivered him into my hand, for he has shut himself in by entering a town with gates and bars'" - 1 Samuel 23:7)
Translation
Expression (Hebrew)
סָגוּר עַל מַנְעוּל וּבְרִיחַ
Definition (Hebrew)
שָׁמוּר וְנָעוּל. סָגוּר וּמְסֻוגָּר.
("וַיֻּגַּד לְשָׁאוּל כִּי בָא דָוִד קְעִילָה וַיֹּאמֶר שָׁאוּל נִכַּר אֹתוֹ אֱלֹהִים בְּיָדִי כִּי נִסְגַּר לָבוֹא בְּעִיר דְּלָתַיִם וּבְרִיחַ"- שְׁמוּאֵל א כג ז)