WordEs la única caja abierta.MeaningIt is the only open checkout.Part of speechsentencePronunciationCourseSpanish (Spain)LessonIn the shop: shoe sizes, light colours and the till (el número, claro, la caja)Breakdown of Es la única caja abierta.serto beabiertoopenla cajathe checkout, the till (in a shop)únicoonly (the only one)