top up ( synonym found)
Definition of top up:

°to fill something.
"I shall top up with petrol before the long trip."
°to extend the credit of something.
"I shall top up the mobile phone at the supermarket."
Definition of top up:

°to fill something.
"I shall top up with petrol before the long trip."
°to extend the credit of something.
"I shall top up the mobile phone at the supermarket."
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