1. third-person singular preterite or conditional form of 'robustecer' (to become robust, to strengthen, to grow stronger)
The economy robustecia-se after the reforms were implemented.
A economia robustecia-se após as reformas serem implementadas.
2. reflexive form indicating a process of becoming more robust, sturdy, or resilient
His argument robustecia-se with each piece of evidence.
Seu argumento robustecia-se com cada prova apresentada.