The Vietnamese word "díu" is a regional term that typically refers to the action of squinting or narrowing one’s eyes, usually in response to bright light or to focus better on something. It can also imply a certain expression of discomfort or concentration.
You would use "díu" when you want to describe someone who is trying to see something better in bright light or someone who is concentrating very hard.
In a more advanced context, "díu" can be used metaphorically to describe someone who is trying hard to understand something complicated or when someone is being cautious or skeptical about a situation.
"Díu" does not have many direct variants, but you might encounter related expressions that describe different states of vision or focus.
While "díu" primarily refers to the action of squinting, in some regional dialects, it might carry connotations related to expressions of suspicion or doubt when someone is "squinting" at a situation or information.
"Díu" is a useful term to express squinting or narrowing one's eyes, commonly in bright conditions or when focusing intently.