to bet bottom dollar
01
to be absolutely sure that something is true
![to [bet] bottom dollar definition and meaning](https://cdn.langeek.co/photo/46670/original/?type=jpeg "to [bet] bottom dollar definition and meaning")
Idiom
Informal
例子
He's a reliable mechanic, and I would bet my bottom dollar that he'll fix your car without any issues.
to be absolutely sure that something is true
IdiomInformal
