予告

1. Origins, structure, and basic meaning

• Structure: 予告(よこく) means announcing something before it happens.
• Basic usage: It can refer to a trailer in a film context or to advance notice about business operations.

2. Common pitfalls and similar expressions

• Notice and prediction
  • 予測 predicts what may happen; 予告 focuses on informing others beforehand about what is to come.
• Without notice
  • 予告なく means without advance notice. 予告なく変更する means making a change without prior notice.