Definition
This phrase is used to express that someone or something has caused damage or created a difficult situation that is beyond repair.
這下可糟了！
"That's done it!" he said looking at the computer screen, "I accidentally deleted the important file."
「這下完蛋了！」他看著電腦螢幕說，「我不小心刪掉了重要的檔案。」
"Oh no, that's done it!" she exclaimed, "I spilled coffee all over my report."
「哦不，這下完蛋了！」她驚呼道，「我把咖啡灑在了我的報告上。」
When he realized he had missed the last train, he said, "That's really done it!"
當他意識到自己錯過了末班車時，他說：「這下真的完蛋了！」