# head of steam

idiom

Source: https://englishreference.com/idiom/head-of-steam
Updated: 2026-08-10

## Meaning

A significant amount of energy, vigour or momentum, sufficient to make progress or succeed in a task.

## Examples

- The team has a head of steam and will finish the project today.
- He builds up a head of steam when he works on his hobby.
- After a slow start, the campaign gained a head of steam and reached thousands of new voters.
- The new restaurant picked up a head of steam after a famous food critic shared a positive review on social media.
- I finally have a head of steam with my studies, so I want to finish two more chapters before I take a break.
- Once the movement gathered a sufficient head of steam, it became impossible for the local authorities to ignore the growing public demand for reform.

## Origin

The term originates as a metaphor for the literal requirements of the steam locomotive. It denotes the accumulation of internal pressure within a boiler, which was required to reach a specific threshold before the engine could achieve movement. The figurative application followed this mechanical necessity, equating the build-up of physical vapour with the gathering of momentum.

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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.