This is the 4151st most frequent French word.
creux
"Hollow" or "empty."
In this sentence, 'creux' refers to a physical indentation or hollow space in an object.
Il y a un creux dans la table.
There is a dent in the table.
Here, 'creux' figuratively describes feeling an emptiness related to hunger or lack of food.
Je suis un peu creux, allons manger quelque chose.
I'm a bit hungry, let's eat something.
In this case, 'creux' means the hollow or cavity part of an object, specifically the tree's hollow.