Definition of longshore drift noun from the Oxford Advanced Learner's Dictionary

 

longshore drift

 noun
noun
BrE BrE//ˌlɒŋʃɔː ˈdrɪft//
 
; NAmE NAmE//ˌlɔːŋʃɔːr ˈdrɪft//
 
, NAmE//ˌlɑːŋʃɔːr ˈdrɪft//
 
[uncountable](specialist)
 
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the movement of sand, etc. along a beach caused by waves hitting the beach at an angle
See the Oxford Advanced American Dictionary entry: longshore drift