over·hear 
/ˌoʊvɚˈhiɚ/ verb
over·hears; over·heard /ˌoʊvɚˈhiɚ/ verb /-ˈhɚd/ over·hear·ing : to hear (something that was said to another person) by accident [+ obj] ▪ She overheard what her boss said to his secretary. ▪ I overheard a rumor about you. ▪ We overheard their discussion of the project. = We overheard them discussing the project. ▪ They were overheard discussing the project. [no obj] ▪ I couldn't help but overhear. = I couldn't help overhearing. [=I couldn't avoid hearing what was said]
