flub

1. V-T If you flub something that you are trying to do, you are unsuccessful or you do it badly. 弄糟[美國英語] [非正式]

If you try a sales technique and flub it, not making a sale, will you try it again?

如果你嘗試了一種銷售技巧，但是沒有成功，一份單子都沒做成，你會(huì)再試一次嗎？

2. N-COUNT A flub is a mistake or an unsuccessful attempt to do something. 過失[美國英語] [非正式]

...a flub that made listeners cringe. ...使所有聽眾都憎惡的一次過失。