to have the patience of a saint, to have thick skin
Você precisa ter sangue de barata para trabalhar com atendimento ao público.
You need the patience of a saint to work in customer service.
The expression uses an image of "cold blood" to suggest calmness. Cockroaches have hemolymph rather than human red blood, and this fluid can vary in color. Blood pigments do not carry feelings, and the insects do respond to threats; the comparison with indifference is a metaphor.
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