Dictionary
Words, grammatical forms and meanings linked to the ontology.
upon one's speed en · ADP
Meanings
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(obsolete) At speed; moving rapidly.
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.
1662, Thomas Salusbury, Galileo's dialogue Concerning the Two Chief World Systems (Dialogue Two)Riding on the speed down a steep Hill.
1670, John Milton, The History of Britain, That Part Especially Now Call'd England:
Forms