Start a sea journey (3,4)
I believe the answer is:
set sail
(Other definitions for set sail that I've seen before include "have started journey" , "Embark on a voyage by ship" , "Begin a voyage" , "Leave for (sea) voyage" , "left land behind" .)
I believe the answer is:
set sail
(Other definitions for set sail that I've seen before include "have started journey" , "Embark on a voyage by ship" , "Begin a voyage" , "Leave for (sea) voyage" , "left land behind" .)