noun
threatening letter; intimidating letter
A letter sent to threaten or intimidate someone, often demanding money or action.
彼は脅迫状を受け取って警察に通報した。
He received a threatening letter and reported it to the police.
脅迫状には「金を用意
The threatening letter said, 'Prepare the money.'
脅迫電話 is a threatening phone call, whereas 脅迫状 is a written letter.
Compound of 脅迫 (threat, intimidation) and 状 (letter, document).