市いちに虎とらを放はなつ

expression, godan verb (-tsu)

let a fox into the henhouse; do something dangerous; let loose a tiger in the marketplace

Idiomatic expression meaning to create a dangerous situation by introducing a threat into a vulnerable place. The literal image is releasing a tiger in a marketplace, but the English equivalent 'let a fox into the henhouse' is often used.

• あの会かい社しゃに彼かれを雇やとうのは、市いちに虎とらを放はなつようなものだ。

  Hiring him at that company is like letting a fox into the henhouse.