Verb top off has 2 senses
  1. top, top off - finish up or conclude; "They topped off their dinner with a cognac"; "top the evening with champagne"
    --1 is one way to complete, finish
    Sample sentences:
    Somebody ----s something
    Something ----s something
  2. top off - fill to the point of almost overflowing; "She topped off the cup"
    --2 is one way to
    fill, fill up, make full
    Sample sentence:
    Somebody ----s something
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TOP