When liquid gushes out of something, or when something gushes a liquid, the liquid flows out very quickly and in large quantities.

A gush of liquid is a sudden, rapid flow of liquid, or a quantity of it that suddenly flows out.

If someone gushes, they express their admiration or pleasure in an exaggerated way.

You can use gush in expressions such as a gush of enthusiasm to refer to a sudden intense feeling or an expression of a feeling.