slog vs keep one's shoulder to the wheel

slog and keep one's shoulder to the wheel both are verbs.

Word	Noun	Adjective	Verb	Adverb
slog	No	No	Yes	No
keep one's shoulder to the wheel	No	No	Yes	No

As verbs, slog and keep one's shoulder to the wheel are synonyms defined as:

slog and keep one's shoulder to the wheel: work doggedly or persistently

Other synonyms of slog include keep one's nose to the grindstone, peg away, plug away.

slog (verb)	keep one's shoulder to the wheel (verb)
strike heavily, especially with the fist or a bat	work doggedly or persistently
walk heavily and firmly, as when weary, or through mud
work doggedly or persistently