top up

动词

中文：充值

To refill (or recharge) something. · I shall top up with petrol before the long trip.· Please top up the tank tonight.
To add to a balance in an account (e.g., mobile payment, debit card, bank account). · I shall top up the mobile phone at the supermarket.· Users can top up their wallet balance and start sending and receiving money between mobile phones.
To add to a number or amount, to bring something up to a certain level.
To have sex (with). (slang) · We had dinner, went back to her place, and started topping up.

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