Definition of "show up"

show up

verb
third-person singular simple present shows up, present participle showing up, simple past showed up, past participle shown up
1. (intransitive) To appear, arrive, or attend, especially suddenly or erratically.
  Quotations
  “We showed up. We showed up,” Mr. Biden said at a news conference at the United Nations summit on climate change, known as COP26, in Glasgow, Scotland. “The fact that China is trying to assert, understandably, a new role in the world as a world leader, not showing up? Huh. The single most important thing that’s gotten the attention of the world is climate.”
  2021 November 2, Jim Tankersley, Katie Rogers, Lisa Friedman, quoting Joe Biden, “With Methane and Forest Deals, Climate Summit Offers Hope After Gloomy Start”, in The New York Times‎
2. (intransitive) To be easily visible; to be conspicuous.
3. (transitive) To make visible; to expose.
4. (transitive, idiomatic) To make visible or expose faults and deficiencies in, usually by outdoing, outperforming, or outcompeting another.
  Quotations
  His team were not outclassed but, once again, England have reminded us of their habit of being shown up as soon as they face half-decent opposition and one or two authentic category-A footballers.
  2014 June 20, Daniel Taylor, “World Cup 2014: Uruguay sink England as Suárez makes his mark”, in guardian.co.uk