1. imperfect indicative third person singular of 'tranquilizar-se', expressing a habitual or continuous action in the past where someone was calming themselves or becoming tranquil
He was calming himself with deep breaths.
Ele tranquilizava-se com respirações profundas.
2. to soothe oneself, to find peace or composure, reflexive action of tranquilizing
She tranquilized herself before the presentation.
Ela tranquilizava-se antes da apresentação.