Where junk might be lost (2,3)
I believe the answer is:
at sea
I believe this is a double definition.
'where junk might be' is the first definition.
(junk is a type of ship)
'lost' is the second definition.
(thesaurus)
(Other definitions for at sea that I've seen before include "Confused (in the main?)" , "on board" , "Worse things can happen here" , "Lost or confused - on the briny?" , "disorientated" .)