The overside or up-side of a flat object such as a table, or of a liquid.

The outside hull of a tangible object.

(figurative) Outward or external appearance.

(mathematics, geometry) The locus of an equation (especially one with exactly two degrees of freedom) in a more-than-two-dimensional space.

(transitive) To provide something with a surface.

(transitive) To apply a surface to something.

(intransitive) To rise to the surface.

(transitive) To bring to the surface.

(intransitive, figurative) To come out of hiding.

(intransitive, of information or facts) To become known or apparent; to appear or be found.

(transitive) To make (information or facts) known.

(intransitive) To work a mine near the surface.