keep one's shoulder to the wheel vs slog

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

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

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

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

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

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