There are several synonyms for the phrase "addrest oneself," which means to direct one's attention or efforts towards a specific task or objective. Some common alternatives include "focus," "concentrate," "devote oneself to," "apply oneself to," "attack," "tackle," and "attend to." These words all convey a sense of purposeful action or determination to achieve a particular goal, whether it be completing a task, mastering a skill, or solving a problem. By using synonyms for "addrest oneself," we can vary our language and communicate our intentions more effectively, whether in written or spoken communication.