cook off

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive, US, military To pull the pin from a grenade and wait two or three seconds before throwing.
• verb transitive, US, military As with above, except to unintentionally wait so long that the grenade detonates.
• verb transitive, chemistry, military To cause an accidental detonation of explosives, especially due to excess heat.
• verb intransitive, chemistry, military To accidentally detonate, especially as the result of excess heat.