The Vietnamese word "nháy" primarily functions as a verb and means "to blink" or "to wink."
In a broader context, "nháy" can convey the idea of quickly opening and closing the eyes, often to convey a message or to tease someone.
While "nháy" primarily refers to the action of blinking or winking, it can also be used metaphorically to suggest quick movement or sudden changes, like "nháy mắt" meaning "to act swiftly" in some contexts.