run up against
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
According to Thierry Poibeau, these detection systems also run up against a "moving target problem" because AI programs are "constantly evolving".
From Barron's ● Sep. 25, 2026
Efforts to narrow that definition, the court found, run up against those statutory protections.
From Salon ● Apr. 25, 2026
Management made the forecast as gains in running shoes, soccer gear and a rebound in North America run up against an array of other problems.
From MarketWatch ● Mar. 31, 2026
The companies have run up against capacity constraints and plan to spend billions to increase their energy supplies.
From The Wall Street Journal ● Dec. 22, 2025
Frank and Joe had already run up against him once on a case, when they were trying to find the missing money from a video-game competition.
From "Hopping Mad (The Hardy Boys: Secret Files, #4)" by Franklin W. Dixon
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