"Getting in to the act" means becoming involved in a particular activity or situation. There are several synonyms for this colloquial phrase, such as "jumping in," "joining in," "participating," "contributing," "entering the fray," "getting involved," "joining the party," "coming to the party," "pitching in," and "stepping up." Each of these phrases carries a slightly different connotation, depending on the context in which it is used. Regardless of which phrase you choose to use, the idea remains the same: to become actively engaged and participate in a particular situation or activity.