If someone or something is on the crest of a wave or on the crest of the wave, they are experiencing great success. Founded in 1972, the group's members are confident they're on the crest of a wave. The sport at the moment is on the crest of the wave. Note: You can also say that someone is riding the crest of a wave or riding the crest of the wave. McCarthy's side looked like a team riding the crest of the wave. Note: Nouns such as success or popularity can be used instead of wave. Now, 14 years later, he is riding a crest of remarkable popularity. Note: The crest of a wave is its highest point.