unplug has 1 distinct synonym spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is plug in.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
pull the plug of (electrical appliances) and render inoperable
“unplug the hair dryer after using it”
Synonyms, antonyms and the broader and narrower relations for unplug come from Princeton University’s WordNet. Full sources and licences.