eavesdrop

/ˈiːvzdrɑːp/

eaves·drop

BrE /ˈiːvzdrɒp/

NAmE /ˈiːvzdrɑːp/

[I]

~ (on sb/sth)

to listen secretly to what other people are saying

We caught him eavesdropping outside the window.

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eaves·drop·per

BrE /ˈiːvzdrɒpə(r)/

NAmE /ˈiːvzdrɑːpər/