Strong's H4525מַסְגֵּר: a fastener, i.e. (of a person) a smith, (of a thing) a prison KJV:prison, smith.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 1462: סָגַרsāgar — shut, close; close up, closed up, closely joined, shut up, prized, rare, fine; closed; deliver up; surrender; deliver, give over, inclose, repair, stop