longshore drift
noun/ˌlɒŋʃɔː ˈdrɪft/
/ˌlɔːŋʃɔːr ˈdrɪft/
[uncountable] (specialist)- the movement of sand, etc. along a beach caused by waves hitting the beach at an angle
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longshore drift
Definition of longshore drift noun from the Oxford Advanced Learner's Dictionary