Pitch up Definition 1 of 3Pro Tip 1/3Unexpected Appearance Used when someone appears without prior notice, often surprising others. I was shocked when Sarah suddenly pitched up at the party. Pro Tip 2/3Informal Usage Commonly used in casual, informal conversations rather than formal ones. Just pitch up whenever you're free; no need for formalities. Pro Tip 3/3Colloquial UK Phrase More prevalent in UK English, may not be well-known or used in other English-speaking countries. He's likely to pitch up at the pub after work.