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float (one's) boat
To make someone happy. Often used in the phrase "whatever floats (one's) boat." A: "What do you want for dinner?" B: "Whatever floats your boat, I'm not even hungry." I think this new job in the lab will really float Isabel's boat.
be floating on air
To be extremely happy. I've been floating on air ever since I got engaged!
float an idea
To suggest something in order to gauge interest in it. Can you float the idea of closing the office early on Fridays in the summer, to see how management reacts?