expression, ichidan verb
look slightly doubtful; look puzzled; tilt one's head slightly
Idiomatic expression describing a gesture of slight confusion or doubt, often with a subtle head tilt. The literal meaning is 'to bend one's small head slightly to one side'.
See also: 小首を傾げる
彼女は小首を傾けて、私の質問を聞いていた。
She listened to my question with her head tilted slightly, looking puzzled.
その説明に彼は小首を傾けた。
He tilted his head slightly at that explanation, looking doubtful.