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English definition of “top sth up”

top sth up

phrasal verb with top     /tɒp/ verb [T] (-pp-)
to make something bigger by adding to it: Although their life cover helps , she suggests topping it up to give extra protection .top sth up with sth He pays 3% of his earnings to the retirement fund and the employer tops this up with another 2%.
(Definition of top sth up from the Cambridge Business English Dictionary © Cambridge University Press)
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