Picture someone walking through deep mud. Every step costs effort, the foot comes up heavy, and still they keep going. That weight sits inside every use of slog: heavy, slow, no skill in it, and it does not stop. Whether the mud is a hill, a pile of work, an opponent who will not give in, or a ball waiting to be hit, the word is always about force and staying power rather than about being quick or neat.
From the word’s history
The sources say slog is probably a variation of slug, meaning to hit very hard, and possibly connected to slough, a muddy place. Both roads lead to the same feel: heavy force, and heavy ground.
字典說 slog 可能是 slug（重重地打）的變體，也可能跟 slough（爛泥地）有關。這兩條線索指向同一種感覺：一邊是很重的力氣，一邊是很重的地面。這也解釋了為什麼「用力揮棒」和「在泥裡硬走」會是同一個字。
Wiktionary entry supplied in packet (source_ref kaikki:3f6f69a190036ae4:723127871): Probably a variation of slug (to hit very hard) or slough.
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