Topic: AIR
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ground2
1 to stop an aircraft or pilot from flying : 
All planes are grounded until the fog clears.
aircraft
[transitive usually passive]TTAAll planes are grounded until the fog clears.2 if you ground a boat or if it grounds, it hits the bottom of the sea so that it cannot move : Both boats grounded on a mud bank.
boat
[intransitive and transitive]TTWBoth boats grounded on a mud bank.3 to be based on something : Lewis' ideas were grounded in his Christian faith.
be grounded in/on something
Lewis' ideas were grounded in his Christian faith.4 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.
child
[transitive] informalI got home at 2 am and Dad grounded me on the spot.5 to make a piece of electrical equipment safe by connecting it to the ground with a wire [= earth British English]
electricity
[transitive] American EnglishTPEground somebody in something
phrasal verbMost seven-year-olds are grounded in the basics of reading and writing.
