If you accuse someone of favouritism, you disapprove of them because they unfairly help or favour one person or group much more than another.
例句
Maria loved both the children. There was never a hint of favouritism.玛丽亚对两个孩子都疼爱有加，向来一视同仁。
英汉词典释义
n.
<贬>偏爱;偏袒
an obvious case of favouritism一件显然偏袒一方的事例He resigned over accusations of favouritism.由于被指责有偏心，他辞职了。He strongly attacked corruption and favouritism in the government.他猛烈抨击政府的腐败与徇私。
英英词典释义
Noun
1. an inclination to favor some person or group
2. unfair treatment of a person or group on the basis of prejudice