Answer: ground

AnswerCrossword Clue
groundto rub together harshly, as the teeth
groundto cause (a ship) to run aground
groundat the place of interest or importance; actively engaged
groundto maintain one's position; be steadfast
groundextensively; thoroughly
groundin an area or situation that one knows well
groundto place on a foundation
groundthe land surrounding a building
groundthe act or sound of grinding
groundto change position in an argument or situation
groundto advance (or fail to advance)
groundto teach the basics to
groundto restrict (an aircraft or pilot) to the ground
groundinto a den, burrow, shelter, or the like
groundcoffee dregs
groundthe basis for a belief
groundto make a certain amount of progress in dealing with a piece of work, subject, treatise, or the like
groundthe earth's solid surface
groundinto action or well under way
groundto pass or travel over a certain area
groundto reduce to particles
groundinto concealment or hiding
groundto become grounded at low water
groundto restrict the social activities of
groundgrade of fineness
groundto operate by turning a crank
groundto place on a foundation
groundto be put out at first base after hitting a ground ball to the infield
GROUNDElectric wire feature
GROUNDPut through a mill
GROUNDMill-processed
GROUNDRun through the mill
GROUNDPulverized
GROUNDGnashed
GROUNDDry land
GROUNDIt may be gained or broken
GROUNDWhat "we cannot hallow": Lincoln.
GROUNDDry land.
GROUNDBasis.
GROUNDDiscipline, as a flier