silent majority
noun [ S ] uk/ˌsaɪ.lənt məˈdʒɒr.ə.ti/ us/ˌsaɪ.lənt məˈdʒɔː.rə.t̬i/
沉默的大多数
a large number of people who have not expressed an opinion about something
A few people have spoken in favour of the new car park, but I'm sure the silent majority are against it. 少数人说同意建造新停车场，但我敢肯定保持沉默的大多数人是反对的。