Loudly voiced one's disapproval

BOOED

Think of the sound a crowd makes when they’re really not happy with a performance.

"Booed" fits because it directly describes someone loudly expressing disapproval, like a crowd at a bad performance or an unpopular decision. The word itself mimics the sound of the action—people shouting "boo!"—so it’s both literal and onomatopoeic. In crosswords, short past-tense verbs like this often pop up for straightforward clues about reactions or noises. Think of sports events or theater heckling where this happens.