field marshal
From Longman Dictionary of Contemporary EnglishRelated topics: Armyfield marshalˈfield ˌmarshal noun [countable] PMAan officer of the highest rank in the British armyExamples from the Corpusfield marshal• She was born in 1895 to an army major and his wife and was granddaughter to a field marshal.• Lady Astor of Hever, daughter of first world war field marshal Earl Haig, has died aged 81.