preexplode

Example:He preempted the enemy's attack by launching a counter-attack early.

Definition:To take action before the critical moment or before the intended time. Often used to beat someone to the punch or to prevent something from happening.

Example:The volcano prerupted before the forecasted date, causing panic among the nearby towns.

Definition:A term not commonly used, but it can be extrapolated to mean to break out before the expected time, often refers to an unexpected event or eruption.