noun
a situation or problem that stops someone from achieving a goal or completing a task
verb
to prevent or hinder the progress of someone or something
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The new regulations may stymie the company's ability to expand into new markets.
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The bad weather could stymie our plans for a picnic this weekend.
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The unexpected traffic jam really stymied our progress on the road trip.
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His fear of failure stymied his efforts to pursue his dreams.