common courtesy
nounUK /ˌkɒmən ˈkɜːtəsi/
US /ˌkɑːmən ˈkɜːrtəsi/
Common courtesy is being polite and kind to other people in everyday life.
Saying thank you when someone helps you is just common courtesy.
RELATED WORDS
OTHER MEANINGS
2. The basic polite behavior that everyone is expected to show.
Holding the door open for the person behind you is common courtesy.
3. Small acts of kindness that show you care about others.
It's common courtesy to reply when someone sends you a message.
4. Treating people fairly and politely without being asked.
Offering your seat to an older person on the bus is common courtesy.