guardian noun
1 person/institution that guards/protects sth
ADJ. self-appointed She has become the self-appointed guardian of the nation's conscience. | moral
VERB + GUARDIAN act as The village people act as guardians of the land.
2 person who is responsible for a child
ADJ. legal
VERB + GUARDIAN appoint, appoint sb (as) The court appoints a legal guardian for the child. | act as
You can also check other dicts: guardian (English, 中文解释 ), wordnet sense, Collins Definition