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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 or others' perception of it. Can you float the idea of closing the office early on Fridays in the summer, to see how management reacts?
float a trial balloon
To suggest something in order to get feedback on it. The phrase alludes to the now outdated use of balloons to get information about the weather. When everyone objected to my idea, I reassured them that I was just floating a trial balloon and had not made any sort of decision on the matter.
float a trial balloonmainly AMERICAN
COMMON If someone floats a trial balloon they suggest an idea or plan in order to see what people think about it. The administration has not officially released any details of the president's economic plan, although numerous trial balloons have been floated. Note: Other verbs can be used instead of float. Weeks ago, the Tories were flying a trial balloon about banning teacher strikes. Note: You can call an idea or suggestion that is made to test public opinion a trial balloon. The idea is nothing more than a trial balloon at this point. Note: Balloons were formerly used to find out about weather conditions.