The sound of "kacha" can be described as a sharp, crisp sound. It is similar to the sound of two hard objects clashing together, such as when someone snaps their fingers or claps their hands. In English, this sound can be referred to as a "clack", "snap", or "clap". It is also sometimes used to describe the noise made by a typewriter key being pressed or an old-fashioned cash register being opened and closed.