To carry or drag something heavy with difficulty, or to pull along with effort.
Possibly from Scandinavian languages; related to Swedish 'lugga' meaning to pull. The term has meant 'to carry with difficulty' since at least the 1600s.
When you 'lug' something, you're using full-body effort—it's why we say 'lug nuts' on car wheels; they're not light taps but heavy, serious fasteners that need muscle to remove!
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