To walk heavily, slowly, and with difficulty
To do tedious, laborious, and sometimes menial work
To deliver a powerful blow to suddenly and sharply
Prolific electronica musician Moby had a long, hard slog to the top of the charts.
If your business has low margins, you may survive, but it's going to be a tough slog and may simply not be worth pursuing.
It might seem like age 24 is early to achieve the kind of success Paul Wall is achieving, but his hard slog to the top really began in his early teens.
However, it is a long hard slog in League 2 and there are some real bruisers to be found.
impatience of youth pictured an endless slog with a shovel, which indeed it must have been.