shape up

/ʃeɪp ʌp/
verb
  1. To improve one's behavior, performance, or physical condition; to start meeting expectations.
    • The manager warned the employee to shape-up if he wanted to keep his job.
    • After failing the first exam, she decided to shape-up and study harder.
    • The coach told the team they needed to shape-up or they would lose the championship.
Antonyms