balsa de aceite

== Spanish == === Etymology === Literally, “pool of oil”. === Noun === balsa de aceite f (plural balsas de aceite) (idiomatic) a place where there is smooth sailing; sea of tranquillity === Further reading === “balsa de aceite”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025