ˈstumble a ˌcross ˈstumble on ˈstumble up ˌon [transitive] [present tense I/you/we/they stumble across he/she/it stumbles across present participle stumbling across past tense stumbled across past participle stumbled across] phrasal verb
to find something, or to meet someone, by accident
We stumbled across him in the library.
A journalist finally stumbled on the truth.
Main entry: stumble
Useful english dictionary. 2012.