WordNet records no synonym and no antonym for work to rule. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
a job action in which workers cause a slowdown by doing only the minimum amount required by the rules of the workplace
Synonyms, antonyms and the broader and narrower relations for work to rule come from Princeton University’s WordNet. Full sources and licences.