1.NounUsed to indicate behavior or manner characteristic of a sensible and practical person.
"We think we can trust John with this new position, as he has his feet on the ground.; The genre of business advice and career advice sometimes comically mixes its metaphors, as for example when it tells us that we must keep our feet on the ground and must also reach for the stars at the same time."
2.NounUsed other than figuratively or idiomatically: see feet, on, ground.