vote_down
1. [ verb ] (politics) thwart the passage of
Synonyms: defeat kill shoot_down vote_out
Examples:

"kill a motion" "he shot down the student's proposal"

Related terms: veto defeat
2. [ verb ] (politics) vote against
Synonyms: turn_thumbs_down
Examples:

"The faculty turned thumbs down on the candidate for the Dean position"

Related terms: vote