startle reaction,
startle response 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
moro reflex,
startle reflex a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs
jump -
an abrupt transition; "a successful leap from college to the major leagues"
jump -
make a sudden physical attack on; "The muggers jumped the woman in the fur coat"
set on,
assail,
assault,
attack attack someone physically or emotionally; "The mugger assaulted the woman"; "Nightmares assailed him regularly"
jump -
jump down from an elevated point; "the parachutist didn't want to jump"; "every year, hundreds of people jump off the Golden Gate bridge"; "the widow leapt into the funeral pyre"
descend,
come down,
go down,
fall move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"
sky dive,
skydive jump from an airplane and perform various maneuvers before opening one's parachute
jump -
move or jump suddenly, as if in surprise or alarm; "She startled when I walked into the room"
locomote,
travel,
move,
go change location; move, travel, or proceed, also metaphorically; "How fast does your new car go?"; "We travelled from Rome to Naples by bus"; "The policemen went from door to door looking for the suspect"; "The soldiers moved towards the city in an attempt to take it before night fell"; "news travelled fast"
jump -
go back and forth; swing back and forth between two states or conditions
change undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night"
jump -
To employ a move in certain board games where one game piece is moved from one legal position to another passing over the position of another piece.
jump -
To move to a position in a queue/line that is further forward.