blow it and wing it

blow it

【俚】因笨而失去（良機等）；將……搞糟

We had our chance and blew it .
我們曾有一次機會但卻失去了。

wing it

在有限的時間和條件下，臨時拼湊完成一件工作。

I didn’t know I’d have to make a speech—I just had to wing it.