Etymology 1
Uncertain, although usually derived in some way from Waterloo, the site of Wellington's 1815 victory over Napoleon, likely via a pun based on water closet.[1][2][3][4][5][6] Other suggested derivations include corruptions of French l’eau (“water”),[3] lieu (“place”),[3][6][7] lieux d’aisances (“'places of convenience': a lavatory”),[4][5][8] lieu à l’anglaise (“'English place': a British-style lavatory”), bordalou (“a diminutive chamber pot”)[3] or gardez l’eau (“'mind the water'”), via Scots gardyloo, formerly used in Edinburgh while emptying chamber pots out of windows;[3][6][9][10] the supposed use of "Room 100" as the lavatory in Continental hotels;[2][6] a popularisation of lew, a regional corruption of lee (“downwind”), in reference to shepherds' privies or the former use of beakheads on that side of the ship for urination and defecation;[3][11][7][4] or a clipped form of the name of the unpopular 19th-century Countess of Lichfield Lady Harriett Georgiana Louisa Hamilton Anson, who was the subject of an 1867 prank whereby her bedroom's namecard was placed on the door to the lavatory, prompting the other guests to begin speaking of "going to Lady Louisa".[6][12]
Noun
loo (plural loos)
- (UK, Ireland, Commonwealth) A lavatory: a room used for urination and defecation.
1940, Nancy Mitford, chapter II, in Pigeon Pie, page 27:I suppose it is unreal because we have been expecting it [sc. World War II] for so long now, and have known that it must be got over before we can go on with our lives. Like in the night when you want to go to the loo and it is miles away down a freezing cold passage and yet you know you have to go down that passage before you can be happy and sleep again.
2006, Garth Thompson et al., The Guide′s Guide to Guiding, 3rd edition, page 160:Ensure that the tents are well-sited and clean, rubbish bins empty, and that the loos have toilet paper.
- (UK, Ireland, Commonwealth) A toilet: a fixture used for urination and defecation.
2009, Katharina Kane, Lonely Planet: The Gambia and Senegal, page 275:The lack of running water in rural areas often makes Western-style loos hygienic disasters. Suddenly the noncontact squat toilet doesn′t look like such a bad option any more (as long as you roll up your trouser legs).
2010, Meegan Jones, Sustainable Event Management, page 206:Waterless urinals are a great way of keeping the guys out of the cubicle toilets, keeping the urine separated from the solid waste (when using composting loos) and reducing water consumption if you have flush loos.
Etymology 2
Clipped form of halloo.[13]
Interjection
loo
- A cry to urge on hunting dogs.
c. 1603–1606, William Shakespeare, “The Tragedie of King Lear”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene xi]:
Etymology 3
Clipped form of lanterloo.[14]
Noun
loo (uncountable)
- Alternative form of lanterloo: the card game.
1675, [William] Wycherley, The Country-wife, a Comedy, […], London: Printed for Thomas Dring, […], →OCLC; republished London: Printed for T[homas] Dring, and sold by R. Bentley, and S. Magnes […], 1688, →OCLC, epilogue:And my Intreagues ſo baſhfully diſown / That they may doubted be by few or none, / May kiſs the Cards at Picque, Hombre,—Lu, / And ſo be taught to kiſs the Lady too; [...]
- 1731, Jonathan Swift, To Dr. Helsham, 16:
- Yet, ladies are seldom at ombre or lue sick.
- The penalty paid to the pool in lanterloo for breaking certain rules or failing to take a trick.
- An act that prompts such a penalty.
- A game of lanterloo.
- (figuratively) Any group of people.
Etymology 6
Clipped form of lieutenant.
Noun
loo (plural loos)
- (US, military, slang) A lieutenant.
2012, J. D. Robb, New York to Dallas, Penguin, →ISBN, page 91:I asked my loo to let me escort you in. I wanted a moment to thank you personally.” “There's no need.” “So you said before, but there is. And was. I'll take you in to Lieutenant Ricchio.”
References
"loo, n.⁴" in the Oxford English Dictionary (1976), Oxford: Oxford University Press.
Ross, Alan S.C. "Loo" in Blackwood's Magazine (October 1974), Vol. 316, pp. 309–316.
"Loo" (17 July 1983) in John Silverlight's Words (1985), London: Macmillan Press.
"loo" in Webster's New World College Dictionary, 5th ed., Cleveland: Wiley Publishing.
"gardyloo, n." in the Oxford English Dictionary (1898), Oxford: Oxford University Press.
Daiches, David. Was (1975), London: Thames & Hudson.
"† loo, v.²" and "loo, int." in the Oxford English Dictionary (1903), Oxford: Oxford University Press.
"loo, n.¹" and "loo, v.¹" in the Oxford English Dictionary (1903), Oxford: Oxford University Press.
"† loo, n.²" in the Oxford English Dictionary (1903), Oxford: Oxford University Press.
"loo, n.³" in the Oxford English Dictionary (1976), Oxford: Oxford University Press.