1. foul up - Noun
2. foul up - Verb
an embarrassing mistake
make a mess of, destroy or ruin
Source: WordNetfoul-up
In order to get what you want, you must first decide what you want. Most people really foul up at this crucial first step because they simply can't see how it's possible to get what they want, so they don't even let themselves want it. Jack Canfield
I botched the dinner and we had to eat out Source: Internet
the pianist screwed up the difficult passage in the second movement Source: Internet
Her only miss at the line came in the final seconds, but hitting the first allowed DWU (18-8, 11-7) to foul up three instead of letting Morningside (19-8, 13-6) get off a final shot. Source: Internet
Everything is down to someone else’s foul up, whether that’s a quango (created to take tough decisions ministers want to avoid taking themselves), the EU (which they’re still going to find a way to blame for anything they can), or local councils. Source: Internet