1. Third person singular preterite of 'avilantar' - to become bold, audacious, or impudent; to act with excessive familiarity or disrespect
He became emboldened and spoke out of turn.
Ele avilantou e falou fora de hora.
2. To lose respect or propriety; to overstep boundaries
The servant avilantou when speaking to his employer.
O criado avilantou ao falar com seu patrão.