Weigh in is a common phrase used in the English language, particularly in sports, fitness, and entertainment industries. The term refers to expressing an opinion or making a statement on a particular subject matter. However, there are many synonyms for this phrase to add variation to your communication. Some alternative phrases that can be used include 'give your two cents,' 'express your view,' 'state your viewpoint,' 'offer an opinion,' 'convey your thoughts,' and 'declare your stand.' Other synonyms include 'air your thoughts' and 'chime in.' These alternative phrases can be effectively used in different contexts to express viewpoints or opinions.