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Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs