godan verb (-ru), transitive verb
protect to the end; hold on to; defend successfully
Emphasizes fully protecting or keeping something until the end, often against pressure or difficulty. Used for secrets, leads, positions, or promises.
彼は最後まで秘密を守り切った。
He kept the secret to the very end.
チームはリードを守り切
The team held on to the lead and won the championship.