Top-up meaning

(idiomatic) To extend the credit of something.

I shall top up the mobile phone at the supermarket.

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That serves as an addition.

English university students will have to pay top-up fees.

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noun
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Additional credit purchased for a mobile phone.
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(medicine) A dose of epidural anesthetic added to previously injected spinal anesthetic in combined spinal-epidural anesthesia.
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To refill something.

I shall top up with petrol before the long trip.

The waitress topped up my coffee every few minutes.

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(UK) To refill the drink of (somebody)

May I top you up?

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To add to a number or amount to bring it up to a certain level.
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