for the good of the loo, phr. — Green’s Dictionary of Slang

for the good of the loo phr.

[SE loo, a card-game resembling whist; the ref. to the game extends to its players and thence, fig., to the whole community]

for the good of all, for the benefit of the community.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859		Matsell Vocabulum.