slog (v.)youdaoicibaDictYouDict[slog 词源字典]
1824, "hit hard," probably a variant of slug (v.3) "to strike." Sense of "walk doggedly" first recorded 1872. Related: Slogged; slogger; slogging.[slog etymology, slog origin, 英语词源]
slog (n.)youdaoicibaDictYouDict
1846, "a hard hit," from slog (v.). Sense of "spell of hard work" is from 1888.