the expanse of salt water that covers most of the earth’s surface and surrounds its land masses:a ban on dumping radioactive wastes in the sea [as count noun]:the seas today swarm with crustacean arthropods
[often in place names] a roughly definable area of the sea:the Black Sea
(seas) large waves:the lifeboat met seas of thirty-five feet head-on
[count noun] a vast expanse or quantity of something:she scanned the sea of faces for Stephen
at sea
sailing on the sea:he spends long hours at sea on a small catamaran
(also all at sea) confused or unable to decide what to do:he feels at sea with economics
by sea
by means of a ship or ships:other army units were sent by sea
go to sea
set out on a voyage:the fishermen were unable to go to sea in such storms
become a sailor in a navy or a merchant navy:Garret left the small family farm in his late teens and went to sea
on the sea
situated on the coast.
put (out) to sea
leave land on a voyage:the Alabama put to sea the next morning
