Often used metaphorically to imply something is the starting point of a larger event.

Metaphorical Use

Understanding the context is crucial to knowing whether it implies conflict or a neutral event.

Context Sensitivity

It doesn't mean someone physically touched something; it's more about causation.

Used literally to describe a physical, often controlled, explosion or blast.

Using 'touch off' in this sense might be sensitive due to associations with violence.

When used in a technical context, it often relates to precise timing of an explosion.