E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Ag hoc.
“Attend to this.” In sacrifice the Roman crier perpetually repeated these words to arouse attention. In the “Common Prayer Book” the attention of the congregation is frequently aroused by the exhortation, “Let us pray,” though nearly the whole service is that of prayer.
hoc.
