IPA: /ˈbɔːrdruːm/
KK: /ˈbɔrdˌrum/
A room where a group of people, usually in charge of a company or organization, meet to discuss important matters and make decisions.
The boardroom was filled with executives discussing the company's future plans.
Boardroom → It is formed from "board" (from Old English *bord*, meaning a flat surface or table) and "room" (from Old English *rum*, meaning space or area). A boardroom is a room with a table where meetings are held, typically for decision-making by a group of people.
Think of a 'flat surface' ('board') where people gather in a 'space' ('room') to make important decisions.