eavesdrop
/ˈiːvzdrɒp ˈईव़्ज़्ड्रॉप्/ verb [I] ( eavesdropping ; eavesdropped )
eavesdrop (on somebody/something) to listen secretly to other people talking दूसरों की बातों को छिपकर सुनना, कनसुई लेना
They caught her eavesdropping on their conversation.