to bet one's life
01
to express strongly and confidently that something is undoubtedly true or will certainly happen
![to [bet] {one's} (life|boots|bottom dollar) definition and meaning](https://cdn.langeek.co/photo/46670/original/?type=jpeg "to [bet] {one's} (life|boots|bottom dollar) definition and meaning")
Idiom
Informal
例
She would bet her life that her best friend would keep her secret.
He trusted his instincts and would bet his boots that the missing item was in the last place he looked.
