English Slang Collection：
go soft
[释] to lose strength or determination;
[例] The night before we went on our trip to Brazil, Mike went soft, which pissed the rest of the group.;
go south
[释] to turn worse;
[例] Pete's career went south after being busted for false account.
gotcha
[释] to show that you understand sb's words;
[例] A: If you don't wanna miss the flight, I suggest you to start loading the luggage. B: Gotcha!;
Gotcha
[释] I've got you;
[例] "Gotcha,you little thief! " the shopkeeper cried and called the cops.
go the extra mile
[释] to make a special extra effort in order to achieve something;
[例] You have go the extra mile to win their trust back.;
go the knuckle
[释] to have a fight or punch-up;
[例] If you ever do that again, I'll have to go the knuckle.
