| NOUN | act | startle reaction, startle response | a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise) |
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| Meaning | A complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions. | |
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| Synonym | startle response | |
| Broader | startle, jump, start | A sudden involuntary movement |
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