Noun
(usually with have or with) Used 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.
Used other than figuratively or idiomatically: see feet, on, ground.
Source: en.wiktionary.orgKeep your eyes on the stars, keep your feet on the ground. Theodore Roosevelt
My feeling is that maintaining financial independence is also a healthy way to keep my feet on the ground. Valerie Trierweiler
I think that comedians, more than any other type of celebrity, have to keep their humour and keep their feet on the ground. If they start taking themselves too seriously, they're heading for a fall. Jimmy Carr
Be practical as well as generous in your ideals. Keep your eyes on the stars and keep your feet on the ground. Theodore Roosevelt
I got my feet on the ground and I don't go to sleep to dream; You've got your head in the clouds and you're not at all what you seem. This mind, this body and this voice cannot be stifled by your deviant ways. So don't forget what I told you, don't come around, I got my own hell to raise. Fiona Apple
Keep your feet on the ground and you'll lessen the pain. Sicilian Proverb