backlogEnglishOxford New American Dictionarybacklog /ˈbakˌlôɡ, , ˈbækˌlɔɡ , ˈbakˌläɡ, ˈbækˌlɑɡ / ▸ noun an accumulation of something, especially uncompleted work or matters that need to be dealt with: the company took on extra staff to clear the backlog of work.