E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Tu Autem.
Come to the last clause. In the long Latin grace at St. John’s College, Cambridge, the last clause used to be “Tu autem misere’re mei, Domine. Amen.” It was not unusual, when a scholar read slowly, for the senior Fellow to whisper “Tu autem”—i.e. Skip all the rest and give us only the last sentence.
