blowing off

English

present participle of blow off
- 1947 January and February, Cecil J. Allen, “British Locomotive Practice and Performance”, in Railway Magazine, page 39:
  The response to firing is remarkable, and though the 280 lb. pressure seems more in the nature of a reserve for emergencies than a continuous working figure, even with the present-day apology for coal it seldom fell below 250 lb., and could always be brought up to blowing-off point with little difficulty. To this liveliness of steaming the thermic syphons are doubtless the chief contributory.

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