There are several synonyms for the phrase "get a grip on oneself." One common phrase is to "pull oneself together," which refers to the act of regaining composure after a difficult or emotional situation. Another synonymous phrase is to "calm down," which means to relax and control one's emotions. "Collect oneself" is another similar phrase, which refers to taking a moment to gather one's thoughts and emotions before acting or speaking. Finally, "compose oneself" refers to the act of regaining control over one's emotions in a particular situation. No matter which phrase one uses, the goal is to regain self-control and prevent oneself from becoming overwhelmed.