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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!
be floating/walking on air
to be very happy and excited because something very pleasant has happened to you When the doctor told me I was going to have a baby, I was walking on air.