(intransitive) To increase or expand rapidly. / (intransitive) To go up or voyage in a balloon. / (transitive) To take up in, or as if in, a balloon. / (transitive) To inflate like a balloon.

(chiefly US, idiomatic) An educated guess or estimation within acceptable bounds.

A pen, similar in size and shape to a pencil, having an internal chamber filled with a viscous, quick-drying ink that is dispensed at the tip during use by the rolling action of a metal sphere (around 0.7 mm to 1 mm in diameter).

(slang, nonstandard) Alternative form of baller (all senses except "person who divides molten metal")

(nautical) Heavy material that is placed in the hold of a ship (or in the gondola of a balloon), to provide stability. / (figuratively) Anything that steadies emotion or the mind.

To stabilize or load a ship with ballast. / To lay ballast on the bed of a railroad track. / To weigh down with a ballast.

One of several external or internal tanks fitted in submarines; when filled with seawater they allow the boat to submerge; when emptied using compressed air buoyancy is restored and the vessel rises towards the surface. Auxiliary ballast tanks within the pressure hull allow the submarine to be trimmed.

A sealed box with a slit, into which a voter puts a completed voting slip. / The process or method of voting.

(US) A field, stadium or park where ball, especially baseball, is played. / (US, figuratively) The general vicinity; somewhere close; a broad approximation.

Approximate; close; on the right order of magnitude.