Related to word: top
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to pour liquid into a container that is partially full until it reaches the brim
She topped up the water bottle until it was full to the brim.
At the party, we need to top up these drink cans.
He tops up his fuel tank every week to be ready for trips.
to supplement an existing amount, particularly with money, to achieve the desired total
To ensure my account has enough, I top it up with some extra funds each month.
She decided to top up her child's savings account.
He topped up his investment portfolio last week to reach his target.