She enjoys letting the grass grow round her feet.

She is not letting the grass grow under her feet.

He lets the grass grow round his feet.

He never lets the grass grow under his feet.

He managed to lift himself up by his boot-tags.

He managed to lift himself up by his own waistbands.

She managed to pull herself up by her own bootstraps and achieve success.

She managed to lift herself up by her own bootstraps and become a successful entrepreneur.

He tried to take himself up by his own ears.

She managed to raise herself up by her own bootstraps.