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cracking 
1  adj You use cracking to describe something you think is very good or exciting. 
 (BRIT) 
INFORMAL 
(=great, brilliant) 

It's a cracking novel...  
2 If you tell someone to get cracking, you are telling them to start doing something immediately. 
 (BRIT) 
INFORMAL 
get cracking  phrase 
Mark, you'd better get cracking, the sooner the better...