upon one's speed

English

Alternative forms

• upon the speed
• at the speed
• at one's speed
• on one's speed
• on the speed

Prepositional phrase

upon one's speed

1. (obsolete) At speed; moving rapidly.
   • 1662, Thomas Salusbury, Galileo's dialogue Concerning the Two Chief World Systems (Dialogue Two)

     In case any one, riding a horse that was upon his speed, should let a bowl drop out of his hand, that bowl being fallen to the ground would continue its motion and follow the horses steps, without tarrying behind him.

   • 1670, John Milton, The History of Britain, That Part Especially Now Call'd England:

     Riding on the speed down a steep Hill.

References

• John A. Simpson and Edmund S. C. Weiner, editors (1989), “upon one's speed”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, →ISBN.