An onomatopoeia for a light clattering or click-clack sound (e.g., typewriter keys, wooden clogs, small loose objects making noise).
古いタイプライターがカタコトと音を立てた。
The old typewriter made a clack-clack sound.
下駄がカタコト鳴りながら歩く音が聞こえる。
You can hear the clack-clack of wooden clogs as someone walks.
窓辺でカタコトと小さな物がぶつかる音がした。
By the window there was a little clattering sound.