1. A phrase, saying, or way of speaking that is no longer commonly used in modern language; outdated or archaic language
Using 'thee' and 'thou' is an old-fashioned expression that sounds strange to modern ears.
Usar 'vós' é uma expressão antiquada que soa estranha aos ouvidos modernos.
2. A colloquial phrase or idiom that reflects past generations' speech patterns
My grandmother still uses old-fashioned expressions like 'the bee's knees' when she's happy.
Minha avó ainda usa expressões antiquadas como 'fantástico' quando está feliz.