1. a racehorse that performs well on muddy tracks
Usage: horse racing
2. a person who participates in obstacle races or events involving mud
Usage: informal

Examples

• The champion was known as an excellent mudder who thrived in wet conditions.
• After the rain, only the best mudders had a chance of winning the race.
• She’s a tough mudder who loves challenging obstacle courses.
• The track conditions favored mudders over speed horses.
• He trained specifically to become a better mudder for the upcoming event.
• The muddy course separated the true mudders from the fair-weather runners.