noticed, caught sight of
Elle essaya d'ouvrir la porte, mais s'aperçut que c'était impossible.
She tried to open the door, but realized it was impossible.
Suddenly, he caught sight of me.
Au beau milieu de cela, il aperçut quelqu'un sur le quai sombre.
In the midst of it all, he caught sight of someone on the dark platform.
— De tout cœur (1998)