This is the 10894th most frequent Portuguese word.
infiltrar
To penetrate or enter secretly or gradually.
Here, the verb 'infiltrar-se' is used to describe water permeating through a physical barrier.
A água começou a infiltrar-se pelas rachaduras na parede.
The water started to infiltrate through the cracks in the wall.
In this sentence, 'infiltrar' is employed to signify someone joining a group discreetly or undercover.
O agente secreto conseguiu se infiltrar no grupo sem ser descoberto.
The secret agent succeeded in infiltrating the group without being detected.
Here 'infiltrar' conveys introducing or integrating concepts into a broader context deliberately.