dither [ˈdɪðə(r)]

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n.慌张，犹豫不决；v.犹豫不决

to be unable to make a decision about doing something

The sight of the policeman made the murderer all of a dither.一见到警察，那个谋杀者吓得浑身发抖。
He was in a dither.他很慌乱。