What does COB stand for?

Close of business

COB stands for "close of business," which refers to the end of a business' operating hours for the day. It may be used when talking about the hours that a business is open and can take customers or the time of a deadline.

You will most likely see COB in work-related emails, and possibly in text messages. When used in emails, it is typically utilized by a superior who wants something completed by the end of the workday.

As businesses become more accessible online, COB has become less of a description of in-store business hours, and more of a description of the end of the workday for employees. COB may be interchanged with "EOD."


The store's COB is at 9:00 PM every day

COB means close of business

Related Slang


Updated December 8, 2020

COB definition by

This page explains what the acronym "COB" means. The definition, example, and related terms listed above have been written and compiled by the team.

We are constantly updating our database with new slang terms, acronyms, and abbreviations. If you would like to suggest a term or an update to an existing one, please let us know!