守 (shǒu): để bảo vệ

The soldiers guard the border day and night, protecting the country's security.

She promised her mother she would stay at home until her mother came back from work.

The old man has been keeping watch over this small shop for thirty years and has never thought of leaving.

In the last few minutes of the match, the goalkeeper tightly guarded the goal and didn't let the opponent score.

No matter what happens, I will stay by your side and support you.