I. sea ‧ side 1 /ˈsiːsaɪd/ BrE AmE noun
the seaside British English the areas or towns near the sea, where people go to enjoy themselves:
a trip to the seaside
at the seaside
a day at the seaside
II. seaside 2 BrE AmE adjective [only before noun]
relating to places that are near the sea
seaside town/resort
the popular seaside resort of Brighton
a seaside holiday