Flutter (as a noun) refers to a quick, light, irregular movement or tremor, often of a part of the body or a small, rapid flap of wings. It can also describe a vivid, fluttering feeling or excitement. In specialized uses, it denotes a rapid oscillation of a device or signal. Clear, brief distinction of the rapid, non-sustained motion versus a steady flutter helps prevent misinterpretation in context.
Full pronunciation guide
