eavesdrop
verb [intransitive]- eavesdrop (on somebody/something)
to listen secretly to what other people are saying 偷听,窃听(其他人谈话) Word Originearly 17th cent.: back-formation from eavesdropper (late Middle English) ‘a person who listens from under the eaves’, from the obsolete noun eavesdrop ‘the ground on to which water drips from the eaves’, probably from Old Norse upsardropi, from ups ‘eaves’ + dropi ‘a drop’.