slog

Concise Oxford English Dictionary © 2008 Oxford University Press:
slog/slɒɡ/

▶verb (slogs, slogging, slogged)

• 1 work hard over a period of time.

  ■ walk or move with difficulty or effort.

• 2 hit or strike forcefully.

  ■ (slog it out) Brit. informal fight or compete fiercely.

▶noun

• 1 a period of difficult, tiring work or travelling.

• 2 a forceful hit or strike.

– derivatives
slogger noun.

– origin C19: of unknown origin; cf. slug2.