1. To strengthen or reinforce one's confidence, certainty, or belief in something
The positive feedback helped fortify assurance in his abilities.
O feedback positivo ajudou a reforçar a confiança em suas habilidades.
2. To make someone feel more certain or secure about a decision or course of action
The detailed report served to fortify assurance among investors.
O relatório detalhado serviu para reforçar a confiança entre os investidores.