盗聞く

(1)listen without the speaker's knowledge; "the jealous man was eavesdropping on his wife's conversations"

(2)話者の知識なしで聞く

(3)hear, usually without the knowledge of the speakers; "We overheard the conversation at the next table"

(4)通常、話し手に知られずに聞く

(1)We overheard the conversation at the next table

(2)我々は、隣のテーブルの会話を小耳に挟んだ