Japanese by Example
Learning through examples in manga

Deactivating a bomb with 解除

三ツ星カラーズ » Volume 1 » Page 125

A shop owner tells the Colors trio that he’s crafted a bomb.

おやじ:
解除(かいじょ)しなければこの(まち)はドカンだ」
“If you're not able to deactivate it, this district will go kaboom!”

解除(かいじょ) here refers to deactivating (canceling) the bomb.