To come back to the surface after being submerged, or to reappear and become noticed again after being hidden or forgotten.
From the prefix 're-' (again) + 'surface' (top layer or face). As a compound, it developed in English from the literal sense (swimming) to figurative meanings (memories, issues, or people reappearing).
Resurface is brilliant because it works both literally—like when a whale surfaces after diving—and figuratively. A scandal can resurface, a friendship can resurface, or a memory can resurface, all using this image of something coming back up!
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