the law of the jungle
US /ðə lɔː əv ðə ˈdʒʌŋɡl/
UK /ðə lɔː əv ðə ˈdʒʌŋɡl/

1.
a lei da selva, lei do mais forte
a situation in which only the strongest or cleverest people survive and succeed, because there are no rules or laws to protect the weak
:
•
In that cutthroat industry, it's truly the law of the jungle.
Nessa indústria implacável, é realmente a lei da selva.
•
Without proper regulations, the market became a place where the law of the jungle prevailed.
Sem regulamentações adequadas, o mercado se tornou um lugar onde a lei da selva prevalecia.