To be overly suspicious and apprehensive, imagining dangers or problems at every turn; to see a ghost at every step.
他从小胆子小，晚上一个人出门总是感觉一步一鬼，心里很不踏实
He was timid since childhood, and whenever he went out alone at night, he always felt overly suspicious, imagining a ghost at every step, which made him very uneasy.
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