- Being the target of an action.
Etymology: Early Middle English; compound word: up adverb + on preposition
- He was set upon by the agitated dogs
- Incidental to a specified point in time or order of action; usually combined with here-, there- or where-.
- The clock struck noon, whereupon the students proceeded to lunch.
Supplemental Details:Sponsor an extended definition for upon for as little as $10 per month. Click here to contact us.
Full Definition of upon