1. a person who takes risks or tries risky schemes, often with little regard for consequences
Usage: informal; chiefly British
2. a person who relies on luck or chance rather than skill or planning
Usage: informal; chiefly British

Examples

• He's a real chancer—always betting on long shots at the racetrack.
• The startup founder was a chancer who succeeded against all odds.
• Don't trust him with your money; he's a chancer looking for a quick profit.
• She took a chancer's approach to the job interview, winging most of her answers.
• The team's strategy relied on chancers rather than solid preparation.
• He made his fortune as a chancer in the property market during the boom.