keep up appearances
US /kiːp ʌp əˈpɪr.ən.sɪz/
UK /kiːp ʌp əˈpɪr.ən.sɪz/

1.
manter as aparências, salvar as aparências
to pretend to be happier, less poor, etc., than you really are, because you do not want people to know how bad your real situation is
:
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Despite their financial struggles, they tried to keep up appearances for their children.
Apesar das dificuldades financeiras, eles tentaram manter as aparências para os filhos.
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She always dresses well to keep up appearances, even when she's feeling down.
Ela sempre se veste bem para manter as aparências, mesmo quando está se sentindo mal.