Used as a gerund noun meaning the act or instance of shuddering; typically uncountable.
Definitions
The act or instance of trembling or quivering, especially from fear, revulsion, or cold. A sudden shuddering passed through the crowd when the lights went out.
shuddergerund / present participle Used attributively to describe something that trembles or causes trembling.
Definitions
Trembling or quivering; producing or characterized by a shudder. He took a shuddering breath before opening the letter.