The phrase "were big" can be expressed in a multitude of ways depending on the context it is used in. Some synonyms to describe a large size can include: massive, enormous, colossal, gigantic, mammoth, jumbo, substantial, hefty, and sizable. If referring to influence or importance, synonyms may include: significant, prominent, powerful, influential, prevalent, and major. In terms of scope or range, synonyms for "were big" may include: widespread, extensive, comprehensive, global, and far-reaching. Lastly, if emphasizing importance or significance, synonyms can include: vital, critical, essential, necessary, and crucial.