ききこむ

聴き込む
to have heard
聞込む
to get information
to find out
to get wind of

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ききこむ【聞き込む】

〈人が主語〉 obtain information (by inquiry); learn; hear; (うわさを) get wind of…; 〈事が主語〉 reach one's ears [knowledge].

●そんな話をお前はどこから聞き込んだのか. Where did you hear about [get wind of] that?