There are various synonyms that can be used to describe the action of "falls dead", such as collapsing lifeless, drops dead, keels over, passes away, expires, perishes, succumbs, departs. Each term portrays a similar but slightly different connotation of the act of dying or coming to an abrupt end. For instance, while "collapsing lifeless" suggests a sudden loss of consciousness, "perishes" conveys a more formal tone that implies a natural end of life. It is important to choose the right synonym for the context in which it is used to ensure clear and effective communication.