n.an instrument of punishment consisting of a chair in which offenders were ducked in water
同义词：ducking stool
英汉双解大词典
cucking stool/ˈkʌkɪŋ/
1.
N（名词）
a stool to which suspected witches, scolds, etc, were tied and pelted or ducked into water as a punishment 一种刑椅 [history] → compare ducking stool