Definition of "coastlines" [coastlines]

• Plural form of coastline. (noun)

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• "The rumble appeared to be linked to large ocean storms along certain coastlines, but the Californian team could not explain how waves created it."
• "For instance, partial loss of ice sheets on polar land could imply metres of sea level rise, major changes in coastlines, and inundation of low-lying areas, with greatest effects in river deltas and low-lying islands."
• "The coastlines are the quarries, the mangroves, and the flooded areas."