Situated along or near the shore; relating to the coastline or the region immediately next to the water's edge.
From 'along' plus 'shore' (from Old English 'scora,' related to 'cut' or 'shear,' referring to the cutting edge where land meets water). The compound developed naturally to describe coastal phenomena.
The 'shore' part of this word originally meant the sharp edge where land is 'sheared' off by water—it's the same root as the verb 'shear,' which is poetic because coastlines really are carved by water's cutting action!
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