[{"Bold_text": "noun", "List Items": ["a small gravity railroad, especially in an amusement park, having a train with open cars that moves along a high, sharply winding trestle built with steep inclines that produce sudden, speedy plunges for thrill-seeking passengers.", "a car or train of cars for such a railroad.", "any phenomenon, period, or experience of persistent or violent ups and downs, as one fluctuating between prosperity and recession or elation and despair."]}, {"Bold_text": "verb (used without object)", "List Items": ["to go up and down like a roller coaster; rise and fall:a narrow road roller-coastering around the mountain; a light boat roller-coastering over the waves.", "to experience a period of prosperity, happiness, security, or the like, followed by a contrasting period of economic depression, despair, or the like:The economy was roller-coastering throughout most of the decade."]}, {"Bold_text": "adjective", "List Items": ["of, relating to, or characteristic of a roller coaster.", "resembling the progress of a ride on a roller coaster in sudden extreme changeableness."]}]