flub

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

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

如果你尝试了一种销售技巧，但是没有成功，一份单子都没做成，你会再试一次吗？

2. N-COUNT A flub is a mistake or an unsuccessful attempt to do something. 过失[美国英语] [非正式]

...a flub that made listeners cringe. ...使所有听众都憎恶的一次过失。