1. a hard black or dark brown combustible mineral substance used as fuel
2. a piece of coal, especially one that is burning or has been burned

1. to supply with coal
2. to take in coal for fuel

Examples

• The power plant burns coal to generate electricity.
• Miners worked deep underground to extract coal from the earth.
• She threw another piece of coal on the fire.
• Hot coals glowed red in the fireplace.
• The ship stopped at port to coal before continuing its journey.
• Steam locomotives needed to coal frequently during long trips.