Definition of plus four in English:

plus four

(also plus 4)

noun

  • In plural Full, baggy men's knickerbockers, of a style formerly worn generally (and especially for field sports), but now chiefly for golf.

Origin

1920s; earliest use found in Isis Magazine. From plus + four.

Pronunciation

plus four

/ˌplʌs ˈfɔː/