This is the 8084th most frequent French word.
tomer
The word "tomer" doesn't exist in French; it might be a misspelling or confusion with "tomber," which means "to fall."
In this sentence, 'tomber' is used figuratively to describe a profound emotional realization or shock.
Tomber de haut, il a appris la vérité.
Falling from great heights, he learned the truth.
Here, 'tomber' refers to the physical action of something descending or falling physically, in this case leaves.
Les feuilles commencent à tomber en automne.
Leaves start to fall in autumn.
In this usage, 'tomber' is used idiomatically to mean 'falling' into a state, such as becoming sick.