The definition of champ is short for champion, and refers to a winner or someone who excels and enjoys victories.(noun)
An example of a champ is someone who won an Olympic gold medal.
See champ in Webster's New World College Dictionary
Origin: earlier cham; prob. echoic
See champ in American Heritage Dictionary 4
verb champed, champ·ing, champs verb, transitive
Origin: Probably imitative.
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