The phrase "hath to oneself" can be replaced by various synonyms depending on the context of its usage. Some common replacement phrases are "keeping to oneself," "reserving to oneself," "maintaining to oneself," "holding unto oneself," and "retaining for oneself." These synonyms suggest a sense of personal ownership and restraint in sharing or disclosing information or feelings. The phrase "hath to oneself" can also be substituted with more modern language such as "keeping it to oneself" or "keeping mum." Regardless of the synonym chosen, the underlying implication is that the individual is choosing to not reveal or share something with others.