Act up to is a phrase that refers to performing or behaving in a manner that is appropriate for a certain situation or meeting expectations. There are many synonyms for acting up to, such as living up to, keeping up with, meeting, fulfilling, satisfying, and complying with. Some other options may include abiding by, adhering to, matching, rising to, and meeting the standards. No matter which synonym is used, the underlying message is that the individual is expected to do their best to meet the expectations set before them. By acting up to, an individual demonstrates their competence and ability to handle any task presented to them.