expression, godan verb (-ku)
keep one's feet on the ground; be down to earth
Idiomatic expression meaning to be realistic, practical, and not carried away by fanciful ideas. Often used in contrast to being overly idealistic or having one's head in the clouds.
彼は成功しても地に足がついている。
Even after his success, he keeps his feet on the ground.
It's fine to chase dreams, but you also need a down-to-earth plan.