decide against someone or something
to rule against someone or something; to make a judgment against someone or something. We decided against Tom and chose Larry instead. Jane decided against the supplier.
decide among (someone and someone else)
and decide among (something and something else)to choose from three or more people; to choose from three or more things. I couldn't decide among all the choices on the menu. I will decide among Fred, Tom, and Alice.
decide between (someone and someone else)
and decide between (something and something else)to choose one from two people; to choose one from two things. I could not decide between Tom and Wally. We could not decide between those two.
decide for someone or something
to rule in favor of someone or something; to make a judgment for someone or something. The jury decided for the plaintiff. The judge decided for me.
decide in favor of someone or something
to determine that someone or something is the winner. The judge decided in favor of the defendant. I decided in favor of the red one.
decide (up)on someone or something
to choose someone or something; to make a judgment about some aspect of someone or something. (Upon is formal and less commonly used than on.) Will you please hurry up and decide upon someone to vote for? I decided on chocolate.