The phrase "dinning into" can be replaced with several different synonyms depending on the context in which it is used. Some possible alternatives include "drilling into," "hammering in," "reiterating," "emphasizing," "pounding," and "impressing upon." Each of these alternative phrases conveys a sense of repetition, emphasis, or forcefulness that is similar to the original phrase "dinning into." By choosing the most appropriate synonym for your particular situation, you can add variety and nuance to your writing while still effectively conveying the key point or message that you wish to communicate.