killed イディオム
curiosity killed the cat
a very curious person may find trouble or danger Don't ask so many questions. Remenmber, curiosity killed the cat.
A smooth sea never made a skilled mariner.
Overcoming adversity leads to competence.
curiosity killed the cat|cat|curiosity|kill|killed
informal Getting too nosy may lead a person into trouble.

A proverb.
"Curiosity killed the cat," Fred's father said, when he found Fred hunting around in closets just before Christmas.