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Definition of Cook off
1. Verb. (transitive US military) To pull the pin from a grenade and wait two or three seconds before throwing. ¹
2. Verb. (transitive US military) As with above, except to unintentionally wait so long that the grenade detonates. ¹
3. Verb. (transitive chemistry military) To cause an accidental detonation of explosives, especially due to excess heat. ¹
4. Verb. (intransitive chemistry military) To accidentally detonate, especially as the result of excess heat. ¹
¹ Source: wiktionary.com