小报告 xiǎobàogào
[lodge a complaint against sb.with his superior;unhonest information made known to the superiors] 暗中收集情况向上级作的汇报。有时也称“小汇报”
蒋子龙 《锅碗瓢盆交响曲》:“这是黑帐本、小报告,不是正大光明的人所为。”