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What is "top-up"

Longman Dictionary of Contemporary English
top-up
noun
COLLOCATIONS FROM OTHER ENTRIES
top-up card
EXAMPLES FROM CORPUS
▪ Automatic top-up with a ballcock will allow all water in a new pool to pass first through the Eradicator.
▪ Because of its size it is able to keep companies on its books for 20 years or more, providing top-ups when necessary.
▪ Factoring finance sometimes provides the top-up needed to make a buyout possible.
▪ The awards will take the form of a salary top-up for a maximum period of five years.
▪ They see sponsorship as a useful top-up.
Wiktionary
top-up

a. That serves as an addition n. 1 An addition. 2 Additional credit purchased for a mobile phone. 3 (context medicine English) A dose of epidural anesthetic added to previously injected spinal anesthetic in combined spinal-epidural anesthesia

WordNet
top-up

n. an amount needed to restore something to its former level

Usage examples of "top-up".

It seemed that far from a quiet top-up of batteries, he was committed to another marathon shake-hands-and-smile, not this time in the chandeliered magnificence of the Sleeping Dragon's all-purpose hall, but in much more basic space normally used as a schooling ground for five-year-olds in Hoopwestern's outer regions.

Time for a top-up, said the lad, swaying over to the cocktail cabinet.

There would be no rest on the next dark, for apart from infrequent top-ups taken from the wild-grown hydride cells which they would carry with them, the riders would not find food again until they reached the far side of the Wilderness.

The six-monthly top-ups produced nothing at all, and after three years he was graded Persil: investigated in depth and found to be of no intelligence interest.