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to become encumbered and slow. (As if one were walking through a bog and getting stuck in the mud. Often preceded by a form of get.) The process bogged down and almost stopped. The truck got bogged down in the mud soon after it started.
bog down somebody/somethingalso bog somebody/something down
to cause someone or something to stop developing or moving forward The film bogs down after a really great beginning.
Etymology: based on the idea of being trapped in a bog (area of soft, wet earth)
Become stuck, be unable to progress, as in Their research bogged down because they lacked the laboratory expertise. This expression transfers sinking into the mud of a swamp to being hampered or halted. [First half of 1900s]