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bubble. 1  a nearly spherical body of gas contained in a liquid. 2  a small globule of gas in a thin liquid envelope. 3  a globule of air or gas, or a globular vacuum, contained in a solid. 4  anything that lacks firmness, substance, or permanence; an illusion or delusion.
bubble over. 1  1. Literally, of a liquid, to boil so vigorously that it flows out of its container. 2  2. By extension, for an emotion to be exhibited because it is too strong for one to contain. 3  1. Of a liquid, to emerge from something, usually from under a surface, in a bubbling manner. Take a sample of the substance that's bubbling up from the ground. 2. For an emotion to be exhibited because it is too strong for one to contain. Her enthusiasm for the subject she teaches always bubbles up in the classroom.