lighter-headed

After standing in the sun too long, I felt light-headed and had to sit down.

在太阳下站得太久后，我感到头晕，不得不坐下来。

She got light-headed when she stood up too quickly from the sofa.

她从沙发上起身太快时感到头晕。

If you feel light-headed during the hike, stop and drink some water.

如果徒步途中感到头晕，就停下来喝点水。