blow
v. 吹;刮;(被)刮动，吹动;吹，吹奏（哨子、乐器等）;擤（鼻子）;（向某人）送飞吻;吹出（某物）;（使保险丝）熔化，烧断;炸开;泄露
n. (用手、武器等的)猛击;打击;挫折;吹
int. 表示厌烦

【例句】
This examination will determine your final grade. don't blow it.
考试决定你最后的成绩，不要搞砸了。

Don't blow it. It's a top secret. Don't take a risk in letting the cat out of the bag. 　　
别搞砸了。这事儿高度机密。不要冒险走漏了消息。