overhear

/ˌoʊvərˈhɪr/
verb
  1. To hear something by accident or without the speaker's knowledge.
    • The detective pretended to read a newspaper so he could overhear the suspects' plans.
    • I couldn't help but overhear your conversation about the surprise party.
    • She overheard her coworkers discussing the new project while waiting for the elevator.
Synonyms
What does "overhear" mean? | whatsthatwordmean | whatsthatwordmean