ground floor
nounBrE BrE//ˌɡraʊnd ˈflɔː(r)//; NAmE NAmE//ˌɡraʊnd ˈflɔːr//
(British English) (North American English first floor) Parts of a houseto become involved in a plan, project, etc. at the beginning See related entries: Parts of a house
Check pronunciation: ground floor