There are several synonyms for the phrase "begin again." Some of the most commonly used alternatives include "restart," "renew," "start over," "recommence," and "resume." These synonyms can be used interchangeably depending on the context and the tone of the sentence. For example, if someone is starting a new project after a brief hiatus, they can say they are "restarting" or "renewing" their efforts. Similarly, if a person is retaking a class or program they previously dropped out of, they can use the phrase "begin again" or simply say they are "starting over." Whatever the situation, there are several ways to express the idea of starting anew.