Spanish: En este supermercado hay frutas a mares. English: In this supermarket, there are fruits aplenty.
Spanish: Hoy en la playa había gente a mares. English: There were crowds of people on the beach today.
The phrase "a mares" is commonly part of idiomatic expressions in Spanish used to convey abundance or a large quantity. Here are a few examples:
Spanish: Tengo tiempo libre a mares este fin de semana. English: I have plenty of free time this weekend.
Spanish: El restaurante ofrece opciones de comida a mares. English: The restaurant offers an abundance of food options.
Spanish: Estoy rodeado de amigos a mares que me apoyan. English: I am surrounded by a plethora of supportive friends.