Definition:

hollow, hole; slack period

Il s'est caché dans le creux de cet arbre - He hid in the hollow of this tree

Il y a toujours un creux le lundi - There's always a slack period on Mondays

Creux is also an adjective - hollow, slack, concave

Expressions:

• avoir un petit creux (informal) - to be a little hungry/peckish
• avoir une dent creuse - to have a cavity, (inf) to be hungry
• J'ai la tête/cervelle creuse - My mind is blank

(click the little graphic below to hear the Mot du jour pronounced)
Pronunciation: [kreu]