expression, ichidan verb
look slightly puzzled; tilt one's head in doubt
Describes the gesture of tilting one's head slightly to one side when feeling doubtful, puzzled, or questioning something. Often used figuratively for a mental state of mild confusion.
彼の説明に、彼女は小首を傾げた。
She tilted her head slightly at his explanation, looking puzzled.
その不思議な話を聞いて、みんな小首を傾げた。
Hearing that strange story, everyone looked slightly doubtful.