It's the plural form of the word "cime", which translates to "peak" or "summit".
Here are some examples of how it can be used:
* "Les cimes des Alpes sont majestueuses." (The peaks of the Alps are majestic.)
* "Le vent sifflait dans les cimes." (The wind whistled in the peaks.)
* "Les alpinistes ont atteint les cimes." (The climbers reached the peaks.)
So, "les cimes" refers to the highest points of mountains, often associated with a sense of grandeur and achievement.