roller-coaster
UK[ˈrəʊlə ˌkəʊstə]US[ˈroʊlər ˌkoʊstər]
n
An amusement ride consisting of a light railroad track with many tight turns and steep slopes, on which people ride in small, fast open cars.
n
A situation or experience characterized by rapid and extreme changes, especially of emotions or fortunes.
Morpheme Breakdown
roller
coaster
roller
one that rolls
coaster
one that coasts
Etymology
The term 'roller-coaster' is a compound noun formed from two English agent nouns, 'roller' and 'coaster'. It originated in the late 19th century, initially describing a type of inclined railway used for amusement, where a car would 'coast' down a track from a height. The 'roller' element likely refers to the rolling wheels or the rolling motion of the cars. The logic of the word perfectly captures the core experience of the ride: a vehicle that rolls along a track, relying on gravity to 'coast' up and down its hills, which metaphorically extends to any experience with dramatic ups and downs.
Analysis
Structure: roller (one that rolls) + coaster (one that coasts)
- roller: Origin: English (from the verb 'roll' + agent suffix '-er'). Functional role: Noun-forming element indicating an agent or object that performs the action of rolling.
- coaster: Origin: English (from the verb 'coast' + agent suffix '-er'). Functional role: Noun-forming element indicating an agent or object that performs the action of coasting (moving without power, especially downhill).
Examples
The children screamed with delight on the new roller-coaster.
Their relationship has been an emotional roller-coaster over the past year.
The stock market has been on a wild roller-coaster this week.