biggie
n. countable B2 Upper Intermediate US //ˈbɪɡi// UK //bˈɪɡi// big·gie
n. something that is very important, successful, or impressive. It is a casual way to talk about a major event or a big problem.
n. an important, significant, or highly successful person or thing. Informal in register; frequently used in the negative 'no biggie' to dismiss a minor problem.
This new contract is a real biggie for our small company.
I forgot to bring the dessert, but since everyone is already full, it is no biggie.
While the minor software bugs were easy to fix, the security breach was the real biggie that kept the engineering team working through the weekend.
Usage
Commonly used in the idiomatic phrase 'no biggie' to mean 'it is not a problem'.