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float (up)on (something)
To bob, drift, or glide over or on a particular surface. Look at all the ducks just floating on the water! The paper airplane floated upon the air for a few seconds before sinking to the ground.
See also: float
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
float (up)on something
to drift as if on the surface of something; to drift along through the air. (Upon is formal and less commonly used than on.) The little tufts of dandelion seeds floated upon the breeze. The fluff floated on the breeze.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.