0 to add liquid in order to fill to the top a container that is already partly full: --
Mix together some lemon juice and sugar, then top it up with water.
Would you like me to top up your drink?
1 to add more of something, especially money, to an existing amount to create the total you need: --
top-up payments
This is the easiest way to top up your mobile phone.
Students were able to take out loans to top up their grants.
2 to make something bigger by adding to it: --
top sth up with sth He pays 3% of his earnings to the retirement fund and the employer tops this up with another 2%.
Although their life cover helps, she suggests topping it up to give extra protection.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
top sth up