chance upon

• (Received Pronunciation) IPA^(key): /ˈt͡ʃɑːns əˌpɒn/, /ˈt͡ʃæns-/
• (General American) IPA^(key): /ˈt͡ʃæns əˌpɑn/, /-ˌpɔn/

• Audio (General Australian):

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chance upon (third-person singular simple present chances upon, present participle chancing upon, simple past and past participle chanced upon)

1. (transitive, idiomatic) To find (someone or something) by chance.

   Synonyms: chance on, come across, happen on, stumble upon

• “chance upon/on/across” under “chance, v.”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.