How do you say half-term in french?

There isn't a direct translation for "half-term" in French. However, you can use different phrases depending on the context:

For school:

* Vacances scolaires de la Toussaint: This translates to "school holidays of All Saints' Day" and refers to the break in October/November.

* Vacances scolaires d'hiver: This translates to "winter school holidays" and refers to the break in February.

* Vacances scolaires de printemps: This translates to "spring school holidays" and refers to the break in April.

For other contexts:

* Mi-session: This translates to "mid-session" and can be used for breaks in university or work.

* Période de pause: This translates to "break period" and is a general term for a period of time off.

* Semaine de relâche: This translates to "relaxation week" and is another general term for a break.

You can also simply use "la moitié du trimestre" (half of the term) if you are referring to a specific academic term.

The best phrase to use will depend on the specific situation and what you want to convey.