not let the grass grow under feet

not let the grass grow under (one's) feet

To be continually active; to not stand still or be idle (thus giving the grass a chance to grow where you're standing). Don't let the grass grow under your feet, kid. Get to work! Tell them not to let the grass grow under their feet—I want this shed finished by the end of the day.
See also: feet, grass, grow, let, not

not let the grass grow under one's feet

Fig. not to stay in one place for a long time; to be always on the move. He is always doing something. He never lets the grass grow under his feet. I have always thought that I ought not to let the grass grow under my feet. Jane: Last night I told Alan that we needed a new bookshelf, and he had built one by the time I got home today. Jill: Boy, he doesn't let the grass grow under his feet.
See also: feet, grass, grow, let, not
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