This term is part of our Unit 12: Office Hierarchies/ Corporate Titles vocabulary list. Please note that pronunciations can vary slightly even in the same dialect.
USA
UK
USA
UK
usually second in command under the CEO, in charge of overseeing day-to-day administrative and operational functions of the company
USA
UK
"As COO of the company, he regularly met with different department heads in order to keep on top of things."