spark
n. countable C1 Advanced Oxford US //ˈspɑɹk// UK //spˈɑːk// spark
n. a tiny flash of light or a small bit of fire. It can also mean a small feeling or idea that starts something much bigger.
n. a small fiery particle thrown off from a fire or caused by friction; figuratively, a quality or feeling that has the potential to develop into something more significant.
A single spark from the campfire started the blaze.
The teacher's praise provided the spark of confidence the student needed to finish the difficult project.
Historians often debate whether the assassination was the primary cause of the war or merely the spark that ignited long-standing regional tensions.
Usage
Often used in the metaphorical phrase 'a spark of' followed by an abstract noun like interest, hope, or genius.