Sentence:  It now means ominous , as when one speaks of a funny sound in the <WSD>motor</WSD> ; 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 nights '' . 
Meaning of the word marked with <WSD> tags:  machine that converts other forms of energy into mechanical energy and so imparts motion