to stop an aircraft or pilot from flying:
aircraft[transitive usually passive]TTA
All planes are grounded until the fog clears.
if you ground a boat or if it grounds, it hits the bottom of the sea so that it cannot move:
boat[intransitive and transitive]TTW
Both boats grounded on a mud bank.
to be based on something:
Lewis' ideas were grounded in his Christian faith.
to stop a child going out with their friends as a punishment for behaving badly:
I got home at 2 am and Dad grounded me on the spot.
to make a piece of electrical equipment safe by connecting it to the ground with a wire [= earth British English]
electricity[transitive] American EnglishTPE
ground somebody in somethingphrasal verb
Most seven-year-olds are grounded in the basics of reading and writing.