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Definition of ocean trench noun from the Oxford Advanced Learner's Dictionary

ocean trench

noun
 
/ˌəʊʃn ˈtrentʃ/
 
/ˌəʊʃn ˈtrentʃ/
(also trench)
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  1. a long deep narrow hole in the ocean floor
See ocean trench in the Oxford Advanced American Dictionary
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trait
noun
 
 
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