gros poissoncommon nounSyllable Decompositiongros poissonEtymologyexpandfrom gros (big) and poisson (fish), referring to fish caught while fishing, whose capture is more appreciated when they are big.Definition1. An important individual in their field, whom the police would like to arrest (or are happy to have arrested).familiarexpandMexique : un gros poisson de la drogue dans les filetsTranslationsenglish:kingpin