say it: TAH-puhp
top-up is a noun meaning "an amount needed to restore something to its former level". It is pronounced /ˈtɑˌpʌp/ — TAH-puhp. It carries one recorded sense.
Definitions, synonyms and semantic relations for top-up come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. .