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• roller coaster
  roller coaster

  noun

  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.
• roller-coaster
  roller-coaster

  verb (used without object)

  to go up and down like a roller coaster; rise and fall.

roller coaster

¹ American  

noun

roller coasters plural

1. 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.

2. a car or train of cars for such a railroad.

3. any phenomenon, period, or experience of persistent or violent ups and downs, as one fluctuating between prosperity and recession or elation and despair.

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roller-coaster ² American  

[roh-ler-koh-ster, roh-li-] / ˈroʊ lərˌkoʊ stər, ˈroʊ lɪ- /

verb (used without object)

1. 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.

2. 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.

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adjective

1. of, relating to, or characteristic of a roller coaster.

2. resembling the progress of a ride on a roller coaster in sudden extreme changeableness.

roller coaster British  

noun

1. another term for big dipper

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Other Word Forms

Noun Inflected Forms

• roller coasters
  plural

Etymology

Origin of roller coaster¹

First recorded in 1885–90

Origin of roller-coaster²

First recorded in 1960–65

Example Sentences

I asked him if Collins showed any roller coaster of emotions as she watched the returns next to him.

From Slate • Jun. 16, 2026

Chip stocks have led the gains in Asia after a roller coaster week amid geopolitical volatility concerns over inflation and worries over a bubble in AI stocks.

From The Wall Street Journal • Jun. 12, 2026

In recent years, the IRS has been on a roller coaster.

From MarketWatch • Jun. 5, 2026

A roller coaster that when it was created in 2000 “demanded an all-new category just to classify its one of a kind nature,” giving rise to the “giga-coaster.”

From Los Angeles Times • May 29, 2026

Are your other sources lying scoundrels? roller coaster.

From "Woe Is I" by Patricia T. O'Conner