longshore drift

noun
🔊/ˌlɒŋʃɔː ˈdrɪft/
🔊/ˌlɔːŋʃɔːr ˈdrɪft/
[uncountable] (specialist)
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  1. the movement of sand, etc. along a beach caused by waves hitting the beach at an angle沿岸泥沙流