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

 

look

 exclamation
exclamation
BrE BrE//lʊk//
 
; NAmE NAmE//lʊk//
 
 
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used to make somebody pay attention to what you are going to say, often when you are annoyed Look, I think we should go now. Look, that's not fair. Word Origin Old English lōcian (verb), of West Germanic origin; related to German dialect lugen.
See the Oxford Advanced American Dictionary entry: look