Sentence:  It now means ominous , as when one speaks of a funny sound in the motor ; disturbing , as when one says that a friend is acting funny ; and frightening , as when a wife tells the police that it is funny , but her husband has n't been home for two days and <WSD>nights</WSD> '' . 
Meaning of the word marked with <WSD> tags:  the time after sunset and before sunrise while it is dark outside