rat on

rat on
vt. fus.
<非正式>
1. (betray) to rat on sb告密；出卖；背叛
- They were accused of encouraging children to rat on their parents. 他们被指控唆使儿童告发自己的父母。
2. (go back on) to rat on sth
[+ agreement] 背弃有关某事的诺言；在某事上出尔反尔
- She claims he ratted on their divorce settlement. 她声称他违反了他们的离婚协议。

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