串供 chuàngòng
[act in collusion to make each other's confessions tally] 同案犯人互相串通,编造口供
清 陈康祺 《郎潜纪闻》卷二：“凡覊系刑部人犯……案情未定者，概不许出入，以杜传信串供之弊也。”