"A poco" is a common phrase in the Spanish language that means "little by little" or "gradually". There are a variety of synonyms that can be used to convey the same meaning such as "paulatinamente", "poco a poco", "progresivamente", "gradualmente", "paso a paso", "pautadamente", and "uniformemente". These synonyms are often used interchangeably in both written and spoken Spanish to add emphasis or variation to the language. Whatever the context may be, these synonyms provide a more refined and sophisticated way of expressing the idea of slow progression in a natural and relaxed manner.