to make a serious promise or pledge
真剣な約束や誓いを立てる (shinken na yakusoku ya chikai o tateru)
"They made a vow to stay together forever."
"彼らは永遠に一緒にいることを誓いました。" (Karera wa eien ni issho ni iru koto o chikai mashita.)
to feel very happy
to avoid making a decision or choice
to decide to achieve something; to aim for a specific goal
to spend money carelessly or extravagantly
to be responsible for something yourself
to continue doing or supporting something despite challenges