It has a long history, deep roots, far water sources and deep roots. Metaphor has a solid foundation.
Deep roots mean deep and solid roots.
Deep-rooted metaphors are deep-rooted and unshakable.
Deep-rooted metaphors are deep-rooted and unshakable.
Deep-rooted, deep-rooted and solid foundation.
Deep-rooted and unshakable.
Deep root: refers to the joint of melon, fruit, stem and branch. Metaphor is deeply rooted and unshakable.
Deep roots and lush foliage: lush. Only when the roots are deep will the leaves flourish. Metaphor has a solid foundation and will flourish.
A deep-rooted metaphor means that a solid foundation will flourish. With "deep roots and luxuriant leaves".