record-breaker, record-holder - someone who breaks a record

challenger, competitor, contender, rival, competition - the contestant you hope to defeat; "he had respect for his rivals"; "he wanted to know what the competition was doing"

chew, manducate, masticate, jaw - chew (food); "He jawed his bubble gum"; "Chew your food and don't swallow it!"; "The cows were masticating the grass"

chew, manducate, masticate, jaw - chew (food); "He jawed his bubble gum"; "Chew your food and don't swallow it!"; "The cows were masticating the grass"