top off

verb
  1. 1

    To fill or refill the final portion of something that is not empty, until it is completely full.

    โ€œThe waitress topped off my coffee every few minutes.โ€

  2. 2

    To complete, to put the finishing touch to (something).

    โ€œThe banquet was topped off with coffee and chocolate.โ€

Source: https://en.wiktionary.org/wiki/top%20off