Meaning

1 senses
  1. (humorous)A friend by association rather than choice, such as the friend of a partner, spouse or other friend; an acquaintance.

Origin

From friend + -in-law, by analogy with mother-in-law, father-in-law, sister-in-law, brothe

From friend + -in-law, by analogy with mother-in-law, father-in-law, sister-in-law, brother-in-law, etc.

Wiktionary, CC BY-SA 4.0 · source

Forms

plural: friends-in-law
Singularfriend-in-law
Pluralfriends-in-law

irregular · Lesson

See also

neighbours in the dictionary
friend-in-law — meaning, examples, forms, synonyms | Krumeto