HSK 7-9
不约而同
bùyuē’értóng(idiom) (of two or more people) to take the same action without prior consultation; (usu. used adverbially) all (or both) of them, independently; as if by prior agreement
大家不约而同望向门口。
Dà jiā bù yuē ér tóng wàng xiàng mén kǒu.
Everyone looked toward the doorway without prior agreement.
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Appears across levels (7-9) in the HSK 3.0 word list.