English Dictionary
Definition unfriend in British English
unfriend verb
[transitive] verb
/ʌnˈfrend/
Although unfriend has been widely used since the early 2000s, thanks to the rise of social media, the word is in fact much older: the earliest recorded use of it is in a letter by the English writer Thomas Fuller, published in 1659.
1
to deliberately remove someone from your list of friends on a social networking website
