Polish translation: kolejka górska (w wesołym miasteczku)
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Explanation: but only if use is figurative as in the Am. Heritage Dict. def. 2 below, you can use "huśtawka", if literary - stick to roller coaster:
roller coaster n. 1. (...) 2. Something, such as an action, event, or experience, that is marked by abrupt, extreme changes in circumstance, quality, or behavior: “the demographic roller coaster caused by the baby boom” (American Demographics).
pidzej Poland Local time: 20:46 Native speaker of: Polish PRO pts in pair: 1077