(idiomatic, almost always preceded by a) Inferior to the norm. / (idiomatic, almost always preceded by a, always followed by a noun phrase) Inferior to.

(boxing) Of a punch, landing illegally, below the opponent's waist. / (by extension, idiomatic) Unfair; dirty; not according to the generally accepted rules.

(golf) (of a score) Less than par for the hole or course (which in golf, means better than par). / (idiomatic) Not up to the average or normal standard.

Worse or lower than average.

(idiomatic) Common, vulgar; of low standing.

(transitive or intransitive, nautical) To order someone to go below the top deck on a ship.

(intransitive, nautical) To go below deck on a ship; to leave the top deck of a ship.

To go under a marker or limit; to be reduced beyond a certain amount.

past participle of go below

present participle of send below