To marginalize a group of people means to make them feel isolated and unimportant.
例句
The effect of this has been to increasingly marginalize the local authority sector...这件事的影响是使地方当局越来越受到排斥。We've always been marginalized, exploited, and constantly threatened.我们总是遭到排挤、剥削和不断的恐吓。
英英词典释义
Noun
1. the social process of becoming or being made marginal (especially as a group within the larger society);
"the marginalization of the underclass""the marginalization of literature"