дёргаться bedeutet auf Englisch

jerk [jerked, jerking, jerks]▼(intransitive: to make a sudden uncontrolled movement)
verb
[UK: dʒɜːk] [US: ˈdʒɝːk]

start [started, starting, starts]▼(to jerk suddenly in surprise)
verb
[UK: stɑːt] [US: ˈstɑːrt]

twitch [twitched, twitching, twitches]▼(to perform a twitch; spasm)
verb
[UK: twɪtʃ] [US: ˈtwɪtʃ]