Definition of sharpish adverb from the Oxford Advanced Learner's Dictionary

 

sharpish

 adverb
adverb
BrE BrE//ˈʃɑːpɪʃ//
 
; NAmE NAmE//ˈʃɑːrpɪʃ//
 
(British English, informal)
 
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quickly; in a short time If you don’t get it done pretty sharpish, there’ll be trouble.