to keep a secret, mum's the word
Não diga a ela que o chefe vai demiti-la, boca de siri!
Don't tell her that the boss is going to fire her, keep it a secret!
The expression boca de siri ("crab’s mouth") evokes a crab’s mouth imagined as firmly closed. This is an image for a promise of silence, rather than a biological account of how a crab catches prey or what happens after its death.
Source: Priberam.
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