This is the 3293rd most frequent French word.
tombés
"Fallen" or "dropped" (past participle of "tomber").
In this sentence, 'tombés' is used figuratively to describe the emotional state of falling in love.
Nous sommes tombés amoureux lors de notre première rencontre.
We fell in love during our first meeting.
Here, 'tombés' refers to the physical action of falling.
Les livres sont tombés de l'étagère après le tremblement de terre.
The books fell off the shelf after the earthquake.
In this case, 'tombés' conveys the metaphorical sense of being overwhelmed or exhausted.