nettoient
Nettoient is the third-person plural present indicative form of the French verb nettoyer. This verb translates to "to clean" in English. Therefore, "nettoient" specifically means "they clean" or "you all clean" (when used in a formal or plural sense).
The verb nettoyer is a regular -er verb in French, meaning its conjugations follow a standard pattern.
The verb nettoyer can be used in various contexts, from cleaning physical objects and spaces to more