1. present participle of 'hot'; becoming or making hot or hotter
Usage: informal; chiefly British
2. engaging in the activity of driving recklessly or racing cars illegally in streets
Usage: British slang; informal

Examples

• The sun is hotting up the pavement.
• The engine was hotting up after the long drive.
• Tensions are hotting up between the two countries.
• Young people were caught hotting in the city center last night.
• The weather is hotting up as summer approaches.
• The competition is hotting up as we near the finals.