Definition of cool bag noun from the Oxford Advanced Learner's Dictionary

 

cool bag

 noun
noun
BrE
 
; NAmE
 
(also cool box
BrE BrE//ˈkuːl bɒks//
 
; NAmE NAmE//ˈkuːl bɑːks//
 
)
(British English)
 
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a bag or box which keeps food or drinks cold and which can be used for a picnic see also cooler