This is the 5039th most frequent French word.
trancher
To decide or solve definitively; to cut or slice.
Here, 'trancher' is used in its literal sense of 'to slice', typically applied to cutting through an object with a sharp tool.
Il faut trancher cette pomme avant de la manger.
You need to slice this apple before eating it.
In this case, 'trancher' is used figuratively to mean 'to decide' or 'resolve', often when referring to making a final judgment or decision in a contested matter.
Le jury a tranché en faveur de l'accusé.
The jury decided in favor of the defendant.
Here, 'trancher' is employed metaphorically to indicate a stark difference or noticeable contrast between elements.