他假装对项目一无所知来麻痹同事，结果在会议上提出了完美方案。

He ___sandbagged his colleagues by pretending to know nothing about the project, then presented a perfect solution at the meeting.

经理在我还没考虑清楚时就设套让我签了合同。

The manager ___sandbagged me into signing the contract before I could think it through.

士兵们用沙袋加固了河堤以防决堤。

The soldiers ___sandbagged the riverbank to prevent it from collapsing.