expression, ichidan verb
make a vow; take an oath
A formal or solemn expression for making a personal pledge or swearing an oath, often with a sense of determination.
彼は禁酒の誓いを立てた。
He made a vow to abstain from alcohol.
選手たちは優勝を目指して誓いを立て
The athletes took an oath aiming for victory.