
Bank up
Future Planning
Use 'bank up' when talking about preparing for future needs or uncertainties.

I'm banking up some vacation days for a long trip next year.
Financial Context
'Bank up' is often used with money-related topics, suggesting accumulation of funds.

He's banking up his earnings for a down payment on a house.
Abstract Resources
Can also refer to non-material things, like energy or time, being conserved.

She needs to bank up energy before starting the marathon training.
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