food for thought
An idea or issue to ponder, as in That interesting suggestion of yours has given us food for thought. This metaphoric phrase, transferring the idea of digestion from the stomach to mulling something over in the mind, dates from the late 1800s, although the idea was also expressed somewhat differently at least three centuries earlier.
Words nearby food for thought
food combining,
food conversion ratio,
food court,
food desert,
food fish,
food for thought,
food grain,
food group,
food insecurity,
food mile,
food mill