Definition
Indicates that something must occur or be completed no later than the specified time or date.
最進；最晚
You must reply to this email by next Monday at the very latest.
你必須在下週一之前回覆這封電子郵件。
We must leave the office by 5 PM at the latest to catch the train.
我們必須在下午5點之前離開辦公室才能趕上火車。
This report needs to be completed by early next month at the latest.
這份報告最遲需要在下個月初完成。