noun, feminine/klak/plural: claques
slap on the cheek; vamp (of a shoe); overshoe; thrashing; thumping (heavy defeat); claque (group of people hired to either applaud or boo)
Synonyms: gifle, baffe, taloche, shoe claque, chouclaque
Deverbal from claquer (“to clap”). Noun 1 sense 5 developed as paying audience members to applaud started at the Paris Opera.