A person or thing that loses or has lost something, especially a game or contest. Despite being a talented player, he was the loser in the final match.
A person who is disadvantaged or defeated in some way, often used to describe someone unsuccessful in life. He was unfairly labeled a loser because he didn't follow the conventional career path.
A person who is habitually unsuccessful or unlucky. She felt like a loser after failing to secure a job despite numerous interviews.
A losing bet, ticket, or other stake that returns no winnings. After checking the numbers, I tossed the lottery ticket in the trash—it was a complete loser.
A stock, share, or other security that decreases in value during a particular period of trading. Energy stocks were the day's biggest losers on Wall Street.