courtesy call
US /ˈkɜːr.tə.si ˌkɑːl/
UK /ˈkɜːr.tə.si ˌkɑːl/

1.
禮節性拜訪, 禮節性電話
a visit or telephone call made as a matter of politeness or goodwill, rather than for a specific purpose
:
•
The new ambassador paid a courtesy call on the president.
新大使向總統進行了禮節性拜訪。
•
I just wanted to make a quick courtesy call to see how you're doing.
我只是想打個快速的禮節性電話,看看你怎麼樣。