An idiom meaning someone or something is so intimidating or powerful that even a crying child would be silenced.
あの先生は怖くて、泣く子も黙る存在だと言われている。
They say that teacher is so strict that even crying children fall silent.
彼の威圧的な態度は泣く子も黙るほどだ。
His intimidating manner is enough to quiet even a crying child.
あの店の味は強烈で、泣く子も黙る辛さだ。
The flavor at that shop is intense—so spicy it would even quiet a crying child.