一人ひとり相撲ずもうひとりずもうMeanings1nounfighting windmills; tilting at windmills; one-sided struggleIdiomatic expression for a futile, one-sided effort where the opponent is imaginary or unresponsive; often used with 取る (一人相撲を取る).彼かれの抗こう議ぎは誰だれも相あい手てにせず、完かん全ぜんに一人