to feel weak, as if you are about to become unconscious
He faints at the sight of blood.
I nearly fainted in the heat.
After hours of strenuous exercise, he began to feel faint and decided to sit down to catch his breath.
The hiker, deprived of water and food, started to feel faint under the scorching sun.
She hadn't eaten all day, and her energy levels plummeted, making her feel faint and unsteady.
The prolonged exposure to the sweltering heat caused many in the crowd to feel faint during the outdoor event.
