A brief summary of the main points of something, short for 'recapitulation'; also means to put a new cap or cover on something.
From the prefix 're-' meaning 'again,' plus 'cap' which comes from Latin 'caput' meaning 'head.' The summary meaning came from 're-cap' as going back over the main points again.
The word 'recap' is sneaky because it has two completely different meanings from the same word—you can 'recap' a conversation (summarize it) or 'recap' a bottle (put a new top on it). Same word, totally different actions!
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