To Dutch a race: Miss out on vital commonly known race information that negatively affects ones race aspirations.
Example 1: not knowing there's still a competitor in front of you, so when you cross the finish line in second, you think you have won.
Example 2: not knowing a ramp used in training has been removed for the race, causing rider to fall during race.
Example of use 1: "How could you not know there was no nutrition provided in this race?" Answer: "I Dutched it"
Example of use 2: "I completely Dutched this race, I hadn't read the race briefing and didn't realize you could not use a snorkel during the swim"