(idiomatic, slang, non-vulgar) A friend with whom one has a casual sexual relationship.

(US, Mafia, slang) A member of the Mafia in another town or district, but not a direct rival.

(US, Mafia, slang) A personal friend of the speaker/writer who is not a member of the Mafia.

A friend whose influential position is likely to prove useful.

request for friendship (on social media)

(transitive) to send someone a friend request

Someone who is a friend of two or more people, each of whom may not know each other.

A long-standing friend / A friend who is old / aged

(colloquial) a female friend.

(law) A person who represents another person who is under disability or otherwise unable to maintain a suit on their own behalf, and who does not have a legal guardian.