conspire [plot] with ((a person))
- 彼は弟と共謀して父親の土地を無断で売り払った
- He conspired with his brother and sold their father's land without his consent.
- 大統領の殺害は共謀だった
- There was a conspiracy behind the assassination of the president.
- 共謀してクーデターを起こそうとしているのが発覚した
- Their conspiracy to stage a coup d'état was discovered.