"Beat a tattoo" is a colorful idiom that typically means tapping out a rhythmic pattern on a surface, such as a drum or table, with the fingers or hands. There are several synonyms that can be used to describe this action, including drumming, tapping, thumping, pounding, and rapping. Each of these words conveys a sense of repetitive, rhythmic motion that is often associated with music or dance. Other synonyms that may be used include beating, striking, hitting, and knocking. No matter which word is chosen, the image of fingers or hands moving in a steady, pulsating rhythm is sure to come to mind.