# coupler

/ˈkəpɫɝ/ (US) · /kˈʌplɐ/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/coupler
Updated: 2026-10-14

## Definition

a small device that joins two things together, like two train cars, two pipes, or two hoses. You use it so the two parts stay connected and move or work as one.

For teachers: a mechanical or electrical device that links two components, vehicles, or circuits to pass force, motion, or a signal between them. Typically found in railway, trailer, plumbing, and electronics contexts.

## Examples

- The trailer has a strong coupler at the front.
- The workers check the coupler between the two train cars before the train leaves the station.
- Engineers redesigned the coupler to absorb more shock on impact, reducing wear on the freight cars during long journeys across uneven track.

## Synonyms

coupling, connector, link

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.