seven seas

1. 1.

   an informal expression for all of the oceans of the world

   “the old salt had sailed the seven seas”

   Broaderbody of water

Questions about seven seas

What does seven seas mean?

seven seas means "an informal expression for all of the oceans of the world".

Is seven seas a common word?

seven seas is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.