Definition of "turn up"

turn up

verb
third-person singular simple present turns up, present participle turning up, simple past and past participle turned up
1. (intransitive, copulative) To show up; to appear suddenly or unexpectedly.
  Quotations
  Highly providential was the appearance on the scene of Corny Kelleher when Stephen was blissfully unconscious but for that man in the gap turning up at the eleventh hour the finis might have been that he might have been a candidate for the accident ward […]
  1922 February, James Joyce, “Episode 16”, in Ulysses, Paris: Shakespeare and Company, […]
  I haven't booked, so I don't have a clue as to whether the service will be busy or not. Supposedly, reservations are compulsory, but I want to find out what would happen if you just turn up.
  2020 December 2, Paul Bigland, “My weirdest and wackiest Rover yet”, in Rail, page 68
2. (transitive) To cause to appear; to find by searching, etc.
3. (transitive) To increase the amount of something by means of a control, such as the volume, heat, or light.
4. (transitive) To reposition by rotating, flipping, etc. upwards.
5. (transitive, nautical) To belay or make fast a line on a cleat or pin.
6. (intransitive, slang) To party hard, especially when involving alcohol or drugs.
noun
plural turn ups
1. Alternative spelling of turn-up