Think over
Definition 1 of 2
Pro Tip 1/3Deliberate Timing
Used when a decision isn't urgent, and there's time to weigh options. 
Let's think over the options and discuss this next week.
Pro Tip 2/3Open Minded
Implies a willingness to consider different ideas or opinions. 
I'll think over your ideas about the project's direction.
Pro Tip 3/3Serious Consideration
Indicates something is important enough to need careful thought. 
Your offer is generous, I need to think it over carefully.