Of a person: having extensive knowledge of a subject. / Of an argument, etc.: based on good judgment and solid reasoning.

Any member of the order Carcharhiniformes, the largest order of sharks with over 270 species. / A Greenland shark, Somniosus microcephalus.

(idiomatic) The situation in reality as opposed to in the abstract. / (literally) Some aspects of the situation in a particular location.

Situated on the ground floor

The floor of a building closest to ground level; what is also known by some American English speakers as the first floor. (US) / (informal) The initial stage of a project.

(military, slang) A military soldier whose primary role is infantry or the use of ground-based materiel.

A thick copper bar required in telecommunication room installations to provide a central ground-point for equipment.

(Scotland) A person who looks after a large Scottish estate for a Lord, preventing illegal hunting and fishing, and liaises with tenant farmers.

(transitive, idiomatic) To mismanage to the point of ruin. / (transitive, idiomatic) To wear out, especially through excessive use. / (transitive, idiomatic) To discuss ad nauseam.

(aeronautics) Any aerodynamic effects occurring due to a vehicle's body or appendages moving in close proximity to the ground.