To disappear is to go out of sight or stop existing in a way that others can notice. It can happen suddenly, like a magic trick, or slowly over time.
From 'dis-' meaning 'away' and 'appear' from Latin 'apparēre' meaning 'to come into view'. The word literally means 'to un-appear' or 'to move away from sight'.
The word is built like a magic spell: first something appears, then it 'dis-appears'. English often uses 'dis-' like an undo button—appear vs. disappear, connect vs. disconnect.
Complete word intelligence in one call. Free tier — 50 lookups/day.