Serious schlep
I believe the answer is:
trek
(Other definitions for trek that I've seen before include "Long and difficult journey" , "Difficult journey on foot" , "A long arduous walk" , "A long hard march" , "Slog" .)
I believe the answer is:
trek
(Other definitions for trek that I've seen before include "Long and difficult journey" , "Difficult journey on foot" , "A long arduous walk" , "A long hard march" , "Slog" .)