common knowledge
nounUK /ˌkɒmən ˈnɒlɪdʒ/
US /ˌkɑːmən ˈnɑːlɪdʒ/
Something that most people already know.
It is common knowledge that the sun rises in the east.
RELATED WORDS
OTHER MEANINGS
2. Information shared by everyone in a group, so no one needs to explain it.
In our class, the rules are common knowledge by now.
3. A fact so widely accepted that it is treated as obviously true.
That water boils at 100 degrees is common knowledge.
4. Things learned by most people through everyday life rather than special study.
Knowing how to cross the street safely is common knowledge.