IPA: /ˈɡɑːr.dʒən/
KK: /ˈɡɑrdjən/
A person who protects or takes care of someone or something, especially someone who is unable to take care of themselves, like a child or a person with disabilities.
The guardian made sure the children were safe and happy.
Guardian → It is formed from "guard" (from Old French *guarder*, meaning to protect or watch over) and "-ian" (a suffix indicating a person who performs a specific action). The word "guardian" refers to a person who protects or watches over someone or something.
Think of someone who 'watches over' ('guard') another person — that's why a guardian is someone who protects.