Turn that frown upside down is when someone isn't happy and someone else is trying to cheer them up.
Cindy was having a bad day so I told her to turn that frown upside down.
by Yessia Ortiz June 08, 2017
mugGet the turn that frown upside downmug.
Always stay positive, nobody likes grumpy people.
Examples for turning a frown upside down:

Person 1: Do you know Joe?

Person 2: Yeaah.. he really needs to turn his frown upside down.
by Dinges October 28, 2013
mugGet the turning a frown upside downmug.