Thesaurus.com
Dictionary.com
Definitions

upon

[uh-pon, uh-pawn] / əˈpɒn, əˈpɔn /
PREPOSITION
at the time of
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A previous interdiction caught the attention of China, which criticized the U.S. after American forces fired upon and seized an Iranian containership on Sunday.

From The Wall Street Journal • Apr. 22, 2026

Customer Dina Ramona Silva happened upon the Plus Bus’ initial Glassell Park location after moving to L.A. in 2015.

From Los Angeles Times • Apr. 22, 2026

“They expose vulnerable people to exploitation, deny them appropriate care, undermine trust in Medicare, and, when left unchecked, distort the data and assumptions federal policymakers rely upon to oversee these benefits.”

From Los Angeles Times • Apr. 21, 2026

"Did I ever think I was going to be playing for Liverpool in the Premier League? Probably not, but when I'm called upon, I just wanted to do my best."

From BBC • Apr. 21, 2026

Dad and Aunt Maud lived long lives too, and felt the setting sun upon their faces.

From "The Teacher’s Funeral" by Richard Peck