shudder
Definitions
To tremble or shake with a sudden, involuntary movement, typically as a result of fear, cold, or strong emotion.
To vibrate or shake violently, as in the case of a machine or a structure.
Examples
I felt a sudden shudder run down my spine as I walked past the dark, abandoned house.
The thought of having to speak in front of the entire school made her shudder with anxiety.