Solid fossil fuel used for energy production.

Used metaphorically as a source of energy or motivation.

ऊर्जा या प्रेरणा का स्रोत

English Usage: His passion for music was the coal that fueled his dedication.

Hindi Usage: संगीत के प्रति उसका जुनून उसके समर्पण की एक प्रकार की कोयला था।

To increase in size or volume.

To become more intense or pronounced.

और अधिक गहरा या स्पष्ट हो जाना

English Usage: Her feelings for him were swelling with each passing day.

Hindi Usage: उसके लिए उसके जज़्बात हर दिन के साथ और गहरे हो रहे थे।