She always talks in a startled, jumpy way that makes people jump.
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usage
Used to criticize someone for melodramatic overreaction - gasping, shouting, or freaking out at minor things. Often appears in 别一惊一乍的 ('stop being so jumpy'). 乍 here means 'suddenly / abruptly' - same character as in 乍看 (at first glance).
