startle : Idioms & Phrases
startle reaction
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noun 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
startle reaction.
WordNet
startle reflex
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noun a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs
Moro reflex.
WordNet
startle response
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noun 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
startle reaction.