和英辞書

寝耳

noun

the ears of someone sleeping / something heard while sleeping

彼は寝耳に水のように驚いた。

He was surprised as if water had been poured into his sleeping ears.

意味（1）

the ears of someone sleeping

少(しょう)々(しょう)騒(そう)々(ぞう)しいなと思(おも)っている寝(ね)耳(みみ)へ、急(きゅう)に襖(ふすま)を開(ひら)いておとなうものがありました。

Shōshō sōzōshii na to omotte iru nemimi e, kyū ni fusuma o hiraite otonau mono ga arimashita.Someone suddenly opened the fusuma and visited my sleeping ears, which were thinking something was a little raucous.

意味（2）

something heard while sleeping