[{"Bold_text": "noun", "List Items": ["a revolution (in an engine or the like)."]}, {"Bold_text": "verb (used with object)", "List Items": ["to accelerate sharply the speed of (an engine or the like) (often followed byup)."]}, {"Bold_text": "verb (used without object)", "List Items": ["(of an engine) to accelerate; become revved (often followed byup)."]}, {"Bold_text": "verb phrase", "List Items": ["to increase in strength or accelerate sharply:The economy is beginning to rev up."]}, {"Bold_text": "abbreviation for", "List Items": ["revenue.", "reverse.", "review.", "reviewed.", "revise; revised.", "revision.", "revolution.", "revolving."]}, {"Bold_text": "abbreviation for", "List Items": ["Bible.Revelation.", "Reverend."]}]