Sympathetic detonation

A sympathetic detonation (SD, or SYDET), also called flash over, is a detonation, usually unintended, of an explosive charge by a nearby explosion. Sympathetic detonation is caused by a shock wave, or impact of primary or secondary blast fragments.

The initiating explosive is called donor explosive, the initiated one is known as receptor explosive. In case of a chain detonation, a receptor explosive can become a donor one.