E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Qui-Tam.
A lawyer; so called from the first two words in an action on a penal statute. Qui tam pro dom’inâ Regi’nâ, quam pro se-ipso, sequitur (Who sues on the Queen’s account as much as on his own).
