turn thumbs down vs vote down

turn thumbs down and vote down both are verbs.

Word	Noun	Adjective	Verb	Adverb
turn thumbs down	No	No	Yes	No
vote down	No	No	Yes	No

As verbs, turn thumbs down and vote down are synonyms defined as:

turn thumbs down (verb)	vote down (verb)
vote against	thwart the passage of
	vote against