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to raise the level of (a liquid, powder, etc) in (a container), usually bringing it to the brim of the container:
top up the sugar in those bowls
to increase the benefits from (an insurance scheme), esp to increase a pension when a salary rise enables higher premiums to be paid
to add money to (a loan, bank account, etc) in order to keep it at a constant or acceptable level
an amount added to something in order to raise it to or maintain it at a desired level
a top-up loan,
a top-up policy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Nearby words for top-up
top to toe