confidant
🇺🇸
/ˈkɑːnfɪdænt/
🇬🇧
/ˈkɒnfɪdænt/
Someone you trust and share your secrets and private thoughts with.
I consider my sister my closest confidant because I can tell her anything.
我认为我的姐妹是我最亲密的知己,因为我可以告诉她任何事情。