Etymology: Middle English, from Old English grund; akin to Old High German grunt ground
Date: before 12th century
1 a: the bottom of a body of water bplural(1):sediment 1 (2): ground coffee beans after brewing 2 a: a basis for belief, action, or argument <ground for complaint> —often used in plural <sufficient grounds for divorce>b (1): a fundamental logical condition (2): a basic metaphysical cause 3 a: a surrounding area :backgroundb: material that serves as a substratum 4 a: the surface of the earth b: an area used for a particular purpose <the parade ground><fishing grounds>cplural: the area around and belonging to a house or other building d: an area to be won or defended in or as if in battle e: an area of knowledge or special interest <covered a lot of ground in his lecture> 5 a:soil, earthb: a special soil 6 a: an object that makes an electrical connection with the earth b: a large conducting body (as the earth) used as a common return for an electric circuit and as an arbitrary zero of potential c: electric connection with a ground 7: a football offense utilizing primarily running plays
— from the ground up1: entirely new or afresh 2: from top to bottom :thoroughly
— into the ground: beyond what is necessary or tolerable : to exhaustion <labored an issue into the ground — Newsweek>
— off the ground: in or as if in flight : off to a good start <the program never got off the ground>
— on the ground: at the scene of action
— to ground1: into a burrow <the fox went to ground> 2: into hiding <might need to make a run for it and go to ground someplace — Edward Hoagland>