redoubler

The French verb "redoubler" has several related meanings depending on the context:

1. To repeat a school year:
   This is the most common meaning, especially in educational contexts. When a student "redouble" a grade, it means they must repeat the same school year because they did not pass.
   Example: Il a redoublé sa troisième. (He repeated the third year of middle school.)

2. To intensify or increase:
   It can mean to do something again with greater intensity or to double down on an effort or action.
   Example: L’armée a redoublé d’efforts pour gagner la bataille. (The army stepped up its efforts to win the battle.)

3. In music:
   It means to repeat a passage or to increase the tempo or volume.

Synonyms and nuances:

• Réitérer: Means to "repeat" or "do again," but usually without implying failure or intensity. More neutral.

• Doubler (in school): This is similar but less formal than "redoubler." Often used interchangeably.
  Note: "Doubler" literally means "to double," but in school context, it colloquially means repeating a year.

• Intensifier: To "intensify" an action, closer to the second meaning of "redoubler."

Summary:

• Redoubler primarily means to repeat a year in school (for failing to pass).
• It can also mean to intensify or increase an action effort.
• Use depends on context: education vs. general action.