Hello Linky, The expression " we can bet on that" means : We can count on that or depend on that.We can have confidence in that. Example: - " He is too late , I am afraid he won't come". - He is usually punctual . He will come surely . You can bet on that. Other uses of "bet": - a sum of money risked on a certain event such as horse races for example as in stake and gamble: I bet a fortune on that horse . - to choose by considering different probabilities: I bet he won't be able to come