base closure; closing of a military base
Refers to the permanent shutdown of a military installation. Often used in political or news contexts.
The government plans to complete the base closure by next year.
Many soldiers were transferred due to the base closure.
基地 means 'base' (military or otherwise), while 基地閉鎖 specifically refers to the act of closing such a base.
閉鎖 means 'closure' or 'shutdown' in general; 基地閉鎖 narrows it to military base closures.
Compound of 基地 (military base) and 閉鎖 (closure). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese compounding patterns.