"I shall top up with petrol before the long trip.; Please top up the tank tonight.; 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.; The waitress topped up my coffee every few minutes."
2.VerbTo 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."
3.VerbTo refill a drink.
"The waitress topped up my coffee every few minutes."
4.VerbTo add to a number or amount, to bring something up to a certain level.
5.VerbTo have sex (with).
"We had dinner, went back to her place, and started topping up."