This means to step down or get off from something like a bus or horse. People use it when leaving a vehicle or animal.
She alighted from the bus at noon.
He alighted the horse easily today.
When something is alight, it is glowing or on fire. This can be literal light or a bright feeling shown in eyes or face.
The room was alight with bright candles.
His eyes were alight with excitement.
This meaning shows when someone’s eyes or attention stop gently on something. It is often used in writing to show interest or notice.
Her gaze alighted on the old book cover.
Their eyes alighted upon the painting with wonder.