Put your money on somebody/something
Definition 1 of 2
Pro Tip 1/3Gambling Tone
Conveys a casual attitude towards investing or making a choice, with a risk of loss involved. 
In this startup competition, I'd put my money on the tech innovators.
Pro Tip 2/3Not Literal
Often used figuratively rather than implying actual betting. 
Everyone is talking about the election, but I'd put my money on the independent candidate.
Pro Tip 3/3Casual Expression
Commonly used in informal conversation among friends or colleagues. 
You think he'll win the game? I'd put my money on it!