the Mediterranean Sea
We went swimming in the sea.
The refugees were at sea (= in a boat on the sea a long way from land) for 40 days before reaching land.
a sea of sth
put (out) to sea
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(Definition of “sea” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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to make a surface shiny by putting a liquid substance onto it and leaving it or heating it until it dries