"sparking" in the verb sense
1. trip, actuate, trigger, activate, set off, spark off, spark, trigger off, touch off
put in motion or move to act
"trigger a reaction"
"actuate the circuits"
2. spark, sparkle
emit or produce sparks
"A high tension wire, brought down by a storm, can continue to spark"
Source: WordNet® (An amazing lexical database of English)
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