字谜揭晓

as the sea bares her bosom
sea = c (同声。bares her bosom 也有点象c)

to the bright full moon
full moon = o （形象）

you walk on the shore alone
you （alone） = u （同声）

tired, you stop by pier 18

pier 18 = r (英文第十八位字母)

to get a cup of tea
(a cup of) tea = t （同声）

答案： court