Word
COB
Phoneticscob
US/ˈkɑb/
UK/kˈɒb/
Uncountable noun Business
Definition
n. Stands for Close of Business. The end of the working day, usually when you need to finish a task or send an email.
n. Abbreviation for Close of Business. Refers to the end of the standard working day, typically used as a deadline for deliverables or communications.
Examples
“Please send me the report by COB today.”
“The manager requested that all team members submit their weekly timesheets by COB on Friday to ensure payroll processing.”
“While the official deadline is COB, the global nature of the team means that 'end of day' often extends until the final regional office closes its doors.”
Examples
simple
“Please send me the report by COB today.”
contextual
“The manager requested that all team members submit their weekly timesheets by COB on Friday to ensure payroll processing.”
complex
“While the official deadline is COB, the global nature of the team means that 'end of day' often extends until the final regional office closes its doors.”
Usage
Typically used in business contexts as a prepositional object (by COB) or as a temporal marker.
Domain
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
- Frequency
- Occasional
- Level
- B2 · Upper Intermediate
- Updated
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englishreference.com/q/cob