present participle of know the difference between one's ass and a hole in the ground

Someone who takes care of the upkeep of grounds (gardens, a playing field, woodlands, etc.)

(nautical, surfing) A broad undulation of the open ocean, often as the result of a distant disturbance. / (by extension) A broadly-based shifting of public opinion.

plural of groundswell

(rare) A timber beam used as the foundation for a building. / The lowest beam of a door-frame; the threshold.

plural of groundsill

A sheet of waterproof material that is spread on the ground, often beneath a tent, and upon which a person may sit or sleep.

plural of groundsheet

plural of groundsel

Any of several widely-distributed plants, of the genus Senecio, having yellow, daisylike flowers.