The phrase "fit to" can be replaced with several synonyms that convey similar meanings, including "suitable for," "appropriate for," "worthy of," "qualified for," and "capable of." These synonyms all express the idea of having the necessary qualities or abilities to meet a certain standard. For example, someone might be deemed "suitable for" a particular job if they possess the required skills and experience, or an item might be considered "appropriate for" a specific occasion or situation. The use of synonyms can help to add variety to your language and make your writing or speech more engaging.