To attempt or try to do something; to be about to start an action or intend to perform it.
彼は問題を解決しようとするが、なかなかうまくいかない。
He tries to solve the problem, but it doesn't go very well.
子どもが初めて一人で靴を履こうとするのを見て、親は驚いた。
Seeing the child try to put on shoes by himself for the first time surprised the parent.
失敗しても、また挑戦しようとする姿勢が大切だ。
Even if you fail, it's important to have the attitude of trying again.