1. to convert into carbon or charcoal by burning or heating
Usage: British spelling; American equivalent is 'carbonizes'; third-person singular present tense
2. to coat or impregnate with carbon
Usage: technical/industrial context; British spelling

Examples

• The intense heat carbonises the wood, leaving only ash behind.
• When you burn paper, it carbonises and turns black.
• The factory carbonises steel to improve its hardness.
• Extreme temperatures carbonise organic materials.
• The process carbonises the surface of the metal.