Closing
Closure, Shutdown, Lockout, Unsociable
noun, verbal noun, の adjective
A closed chain lets everyone know that a building or store is closing for good. It's got to lockout everyone so they won't try to get in anymore.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
このプールは今月で閉鎖されます。
The pool is closed this month.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.