• major issue; so what
• you say `big deal' to express your opinion that something is unimportant, uninteresting, or not surprising; an informal expression.
• you use big deal in informal expressions which indicate how important or unimportant someone thinks something is.
it's no big deal
• it's no big piece of wisdom, it's so-so, it's not a big issue or matter
it's not such a big deal
• it's no big thing
no big deal
• nothing very important, not a critical issue