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

1.
mantenere le apparenze, salvare le apparenze
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.
Nonostante le loro difficoltà finanziarie, hanno cercato di mantenere le apparenze per i loro figli.
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She always dresses well to keep up appearances, even when she's feeling down.
Si veste sempre bene per mantenere le apparenze, anche quando si sente giù.