Sight unseen

Sight unseen: without the opportunity to look at the object in question beforehand.

Equivalente a "sem verificar antes" ou "no escuro".

• He bought the car sight unseen and was in for a big surprise. [ comprou o carro no escuro e teve uma surpresa. ]
• You should never buy anything sight unseen. [ Você nunca deveria comprar nada sem olhar antes. ]

fonte: www.englishexperts.com.br