Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
rat-tat is a noun meaning "a series of short sharp taps (as made by strokes on a drum or knocks on a door)". It carries one recorded sense.
a series of short sharp taps (as made by strokes on a drum or knocks on a door)
Definitions, synonyms and semantic relations for rat-tat come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.