Definition of ach exclamation from the Oxford Advanced Learner's Dictionary

 

ach

 exclamation
exclamation
BrE BrE//ɑːx//
 
; NAmE NAmE//ɑːx//
 
(Scottish English)
 
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used to express the fact that you are surprised, sorry, etc. Word Origin late 15th cent.: Scottish Gaelic, Dutch, and German.