From Longman Dictionary of Contemporary Englishsparkssparks[plural]ARGUE anger or angry arguments The sparks were really flying (=people were arguing angrily) at the meeting! → spark
Examples from the Corpus
sparks ... flying• Hammer on anvil, sparks flying.• There would be blue sparks flying.• Stirring the embers with a stick sent sparks flying, echoes of the vast starry night.• Nothing Less likely to start sparks flying Than a burnt-out flame.• They've a revolutionary scoreboard for the fans and on the pitch soccer to set the sparks flying. 