This is the 7468th most frequent Japanese word.
傾げ
"傾げ" refers to the act of tilting or inclining something, often the head.
傾げ is used here to describe tilting one's head in confusion or curiosity.
彼は不思議な音を聞いて首を傾げた。
He tilted his head upon hearing the strange sound.
傾げ is used to express a slight physical tilting of her face.
その絵を見て彼女は少し顔を傾げた。
Looking at the painting, she tilted her face slightly.
傾げ illustrates tilting one's head lightly as a gesture of thinking or pondering.