To crane one's neck and retract it, indicating a hesitant or furtive peeking, often out of curiosity or timidity.
他伸头缩颈地往屋子里看，似乎想知道发生了什么，却又不敢完全进去。
He kept poking his head in and pulling it back, peeking into the room as if wanting to know what was happening, yet not daring to fully enter.
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