noun
A casual, emphatic loanword from English 'guts', used for fighting spirit, boldness, or the nerve to do something difficult.
彼はガッツがあるから、どんな試合でも最後まで諦めない。
He has guts, so he never gives up until the very end of any match.
ガッツを見せて、難しい仕事に挑
I showed some guts and took on the difficult task.