Originally, the point on the land or water surface below which a nuclear bomb detonates in the air; now also the point on such a surface at or above the detonation.

(literally) To begin digging in the earth at the start of a new construction, or, originally, for cultivation. / (idiomatic) To initiate a new venture, or to advance beyond previous achievements.

On or above the surface of the ground. / (figuratively) Not dead and buried; alive.

(baseball) A batted ball that bounces one or more times on the infield; a grounder. / (lacrosse) A loose ball that is on the ground during play.

(electronics) To provide proper grounding for a circuit. / (baseball) To become out by hitting a ground ball which is fielded and leads to a force or tag of a runner.

(baseball) An instance of grounding out.

simple past tense and past participle of grind out

Any of very many spiders, of the family Gnaphosidae, that hunt their prey instead of building a web to catch them.

(of a missile) fired from the ground at an aircraft in flight, or at an incoming missile

(of a missile) fired from an aircraft at a target on the ground