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 phrase rests on a fact of biology: a cockroach has no warm red blood but a clear fluid called hemolinfa (hemolymph), with none of the pigment that carries feeling and heat in our veins. Being cold-blooded, the insect seems untouched by anything around it.
Source: Só Português.
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