Strong's G2623 — κατακλείω (verb)
katakleio (kat-ak-lei'-o) v.
1. to shut down (in a dungeon), i.e. incarcerate
[from G2596 and G2808]
KJV: shut up 
Root(s): G2596, G2808 
Hebrew root: κλείω
Occurrences: 2