blow?

Had he not so busy taking about the diamonds, he would have felt the blow.

What does"blow" here mean?

Many thanks

i guess it means impact

Sorry the sentence should be :

Had he not been so busy taking the diamonds, he would have felt the blow.

yjkim2002 could you please paraphrase the sentence?

The impact of someone preventing him from taking the diamonds.

It means someone hit him. He received a 'blow' from someone, a hit, a knock, a punch. 

got it, thanks

please help me !

I am like English , but not understand this language , and not speak and write this ?

a blow can be either a physical hit, if someone hit you with a baseball bat, that would be called a blow.

It can also be an emotional shock.  If someone was told they had cancer and were going to die, that would be an emotional blow.

In both of these cases, a person needs time to recover from this sudden shock, whether it is physical or emotional.  But in this story, they are saying that he was concentrating so hard on stealing the diamonds, he didn't really even notice it.