This came up in conversation with my brother last night - amusingly, in a conversation about the joys of our current economy:
If the expression "bank on it" means to 'trust in / count on something completely, as you would a bank with your money,' then haven't we witnessed the end of an expression?
Fig. to be so sure of something that one can trust it as one might trust a bank with one's money. I will be there on time. You can bank on it. I need a promise of your help. I hope I can bank on it.
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