The Vietnamese word "úa" has a couple of meanings and uses, which can be helpful for learners to understand.
Adjective (Brown): "úa" can describe a color that is brown. This is often used to refer to things like food, materials, or objects that have a brown hue.
Adjective (Waning): In a different context, "úa" can also mean something that is fading or diminishing, often used to describe something losing its vitality or brightness.