Go all out for something Definition 1 of 3Pro Tip 1/3Maximum Effort Use when describing someone's great effort to reach a goal. He went all out to finish the marathon despite his injury. Pro Tip 2/3Serious Intent Shows a person's determination and serious intention in their actions. The team is going all out to secure the championship title. Pro Tip 3/3Not Holding Back Implies not restraining oneself, using all resources available. She went all out for the job interview, preparing for weeks.