food for thought
US /ˈfʊd fɔr θɔt/
UK /ˈfʊd fɔr θɔt/

1.
matière à réflexion, sujet de méditation
something that warrants serious consideration or reflection
:
•
His suggestion gave us all some serious food for thought.
Sa suggestion nous a tous donné matière à réflexion.
•
The documentary provided much food for thought on environmental issues.
Le documentaire a fourni beaucoup de matière à réflexion sur les questions environnementales.