This is the 8725th most frequent Catalan word.
envaeix
"Envaeix" means "invades" in English.
Here, 'envaeix' is used metaphorically to describe an overwhelming emotional state.
La tristesa envaeix el seu cor.
Sadness invades his heart.
In this sentence, 'envaeix' refers to the literal occupation or takeover by a plague in a field.
La plaga envaeix el camp de cultiu durant la nit.
The plague invades the crop field during the night.
Here, 'envaeix' is used in the geopolitical sense, where one country occupies another.