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1. There is a lot of animosity, arguing, or angry tension (between two people). The two managers have drastically different ideas of how the business should be run, so sparks fly whenever they are in a meeting together.
2. There is a lot of romantic and sexual chemistry (between two people). Primarily heard in UK. Sparks flew when I first met my husband. We just had a natural connection that has survived to this day.
make the sparks fly
Start a fight or argument, as in If Mary finds out he went to the races without her, that will make the sparks fly. In this idiom, the small particles of a fire called sparks are transferred to an inflammatory situation. [Early 1900s]
1. If sparks fly between two people, they get angry with each other and argue. They are not afraid to tackle the issues or let the sparks fly when necessary. Tempers flare and sparks fly with great ferocity as the couple argue.
2. If sparks fly between two people, they are very excited by or interested in each other, often in a sexual way. Whenever these two actors are on screen, sparks fly.
strike sparks off each othermainly BRITISH
If people who are trying to achieve something together strike sparks off each other, they react to each other in a very exciting or creative way. They have that creative partnership where they just strike sparks off each other.