Definition of COB

Acronym for close of business. This refers to the end of a normal workday, which in Corporate America is 5pm.

Example: Please send over the document by COB.

Usage of "COB" by Country

Business English is used in many different countries around the world. Some of the words and phrases listed on this site will be understood everywhere Business English is used, but some words and phrases are only used in specific countries. The map below shows where "COB" is most commonly used.

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About This Site

Jargonism is a Business English dictionary. You can learn about words and phrases that are commonly used in the workplace like Circle Back, Thought Leader, and Offsite. We also have a Word of the Day, which is a daily Business English vocabulary word that is commonly used in the workplace.

On this site, we also have templates on how to communicate effectively at work, such as requesting PTO, declining a promotion, and taking a sick day.

Word of the Day

Date: 07/27/2021

Word: Close It Out

Definition: To mark something as completed.

Example: This task has been fixed, so let's close it out within the task tracker.