1. to behave in a manner that is socially acceptable, morally correct, or according to established rules and standards
Children are expected to conduct themselves properly during the ceremony.
Espera-se que as crianças se portem bem durante a cerimônia.
2. to act with dignity, respect, and appropriate decorum in a given situation
He conducted himself properly as a representative of the company.
Ele se portou adequadamente como representante da empresa.