shrinking violet
noun [ C ] informal uk/ˌʃrɪŋ.kɪŋ ˈvaɪə.lət/ us/ˌʃrɪŋ.kɪŋ ˈvaɪə.lət/
腼腆的人，羞怯的人
a person who is very shy or modest and does not like to attract attention
She loves appearing on television and is no shrinking violet when it comes to expressing her views. 她喜欢上电视，而且在表达观点时毫不羞怯。