Definition of tideline noun from the Oxford Advanced Learner's Dictionary

 

tideline

 noun
noun
BrE BrE//ˈtaɪdlaɪn//
 
; NAmE NAmE//ˈtaɪdlaɪn//
 
Coastlines and the sea, Travelling by boat or ship
 
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a line left or reached by the sea when the tide is at its highest point See related entries: Coastlines and the sea, Travelling by boat or ship
See the Oxford Advanced American Dictionary entry: tideline