An instrument of punishment consisting of a chair in which offenders were ducked in water WordNet 3.0 & Open English WordNet

Ducking stools or cucking stools were chairs formerly used for punishment of disorderly women, scolds, and dishonest tradesmen in medieval Europe and elsewhere at later times. Wikipedia

A chair that was used as punishment in Great Britain Wikipedia Disambiguation

chair or commode where offenders are strapped as a form of punishment Wikidata

A kind of chair to which a person (such as a scold or dishonest tradesman) was fastened in order to be punished and socially humiliated, usually by being pelted and hooted at by a mob in front of their own house, but sometimes being taken to water and ducked. Wiktionary

A chair used to punish women, especially scolds, by ducking them in water. Wiktionary