The term 'Small Shake' can be broken down into two crossword solutions, SHIVER and TREMOR. SHIVER is a reflexive response to cold or fear, usually involving an involuntary shaking of the body. TREMOR is an involuntary, rhythmic muscle contraction that causes shaking, usually in the hands or head. Both terms refer to a type of shaking, but SHIVER is usually associated with a sudden, intense reaction, while TREMOR is usually associated with a more sustained, less intense shaking.