What is a sudden motion or shock caused by an unexpected alarm, surprise, or apprehension of danger. After having recovered from my first startle, I was very well pleased with the accident. Spectator called?

startle — A sudden motion or shock caused by an unexpected alarm, surprise, or apprehension of danger. After having recovered from my first startle, I was very well pleased with the accident. Spectator. (Webster's 1913.)

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