obstruct
verb
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To get in the way of so as to hide from sight.
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To impede, retard, or interfere with; hinder.
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To block or fill (a passage) with obstacles or an obstacle. See synonyms at block.
put a monkey wrench in the works of
How often have the words obstruct and put a monkey wrench in the works of occurred in a corpus of books? (source: Google Ngram Viewer )