Present participle of 'dit,' describing the action of making short signals (especially in Morse code) or dotting/marking.
From 'dit,' the onomatopoetic representation of short telegraph signals. The -ing form creates the continuous aspect of the action.
Telegraph operators could recognize each other by their 'fist'—their personal rhythm of ditting and dahhing—as distinctive as a signature, and spies used this to identify allied operators!
Complete word intelligence in one call. Free tier — 50 lookups/day.