How to Say "to boo" in Spanish
The Spanish word for “to boo” is “silbar” — B1 level.
English → SpanishB1
verbB1
expressing disapproval at a show or game

Examples
El público silbó al equipo después de perder el partido.
The crowd booed the team after losing the match.
Los manifestantes silbaron al político durante su discurso.
The protesters hissed at the politician during his speech.
Whistling for hate vs. love
In English-speaking countries, whistling can be a cheer. In many Spanish-speaking stadiums, whistling (silbar) is almost exclusively for booing and disapproval.
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