Utter and Inner Barristers.
An utter or outer barrister means (in some cases at least) a full-fledged barrister, one licensed to practise. An inner barrister means a student. (See Nineteenth Century, No. 1892, p. 775, note.)
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.