French phrase
Je vous laisse décider de ~.
Meaning
I'll let you decide on ___.
When to use it
A polite way to leave a choice to someone else. It works in business and everyday situations, but important decisions may need confirmation.
Example dialogue
Je vous laisse décider de l'heure.
I'll let you decide on the time.
Très bien, je vous propose 19h.
Very well, I suggest 7 p.m.