"Usu" is a term commonly used to indicate a frequent occurrence or habit. Synonyms for this word could include "usually," "typically," or "normally." Other words that can be used to indicate a common practice include "habitually," "repeatedly," or "consistently." In a more casual context, one might use "all the time," "on the reg," or "as per usual." These terms all convey the idea that a particular activity or action is common or expected. When seeking to express the opposite idea, one could use words such as "occasionally," "seldom," or "infrequently".