verb/aθuˈlaɾ/
to dye blue
“El MPCB ha podido saber que una empresa privada local liberaba a la atmósfera y al agua residuos industriales sin procesar —en concreto polvo colorante de color azul—, lo que azuló a varios perros y aves en la zona.” — The MCBP has determined that a local private business released into the atmosphere and water unprocessed industrial waste - specifically a blue dye powder - which has turned blue many dogs and birds in the area.
From azul + -ar (compare Italian azzurrare).