Meaning of “top sth up” in the English Dictionary

"top sth up" in Business English

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top sth up

phrasal verb with top uk /tɒp/ us 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)