bend an ear, investigate, listen in on, tap, listen stealthily, monitor, spy, try to overhear, snoop, wiretap, listen in, bug, listen.
" I wouldn't eavesdrop,"
he told her severely.
hoped the particulars of his fate would be ascertained; and asked if anyone present could help him to any authentic anecdotes of their departed friend.
We can't just sit and eavesdrop.