rat on

• • [口语]
  • 食言；赖账；背约：

    He promised to lend me some money,but he has ratted on me.

    他答应借给我一些钱，但是他说了话不算数。

  • 背叛；出卖；告发，检举：

    The police have found him. Someone must have ratted on him.

    警方找到了他。一定是有人检举他。