you bet your life{informal} Most certainly; yes, indeed; without any doubt. - Used to declare with emphasis that a thing is really so.
Do I like to ski? You bet your life I do. You bet I will be at the party. You can bet your boots that Johnny will come home when his money is gone. Compare: BET ONE'S BOTTOM DOLLAR.
[TahlilGaran] English Idioms Dictionary ▲