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1. Literally, to ignite or set fire to something. A noun or pronoun can be used between "spark" and "off." He sparked off the fireworks, then ran behind the car for cover. Police arrested the man on suspicion of sparking the forest fire off.
2. To cause something to happen or begin; to set something into motion. A noun or pronoun can be used between "spark" and "off." The question sparked off a two-hour debate about the ethics of modifying genetic code before birth. The killing sparked a series of riots off across the country, which gathered momentum into a full-blown revolution.
spark something off
1. Lit. to ignite something flammable or explosive. The lightning sparked afire off. The match sparked off a raging inferno.
2. Fig. to cause or start some violent or energetic activity. We were afraid there would be a riot and the speaker nearly sparked it off. The speaker sparked off quite a discussion.
1. To ignite some fire: Forest rangers think that a cigarette sparked off the blaze. After the fire was extinguished, investigators tried to determine what sparked it off.
2. To set something in motion; trigger something: The assassination sparked off a revolution. Historians disagree about what sparked the riot off.