also *ker-, Proto-Indo-European root meaning "to turn, bend."
It forms all or part of: arrange; circa; circadian; circle; circuit; circum-; circumcision; circumflex; circumnavigate; circumscribe; circumspect; circumstance; circus; cirque; corona; crepe; crest; crinoline; crisp; crown; curb; curvature; curve; derange; flounce (n.) "deep ruffle on the skirt of a dress;" krone; ring (n.1) "circular band;" ranch; range; ranger; rank (n.) "row, line series;" research; recherche; ridge; rink; rucksack; search; shrink.
It is the hypothetical source of/evidence for its existence is provided by: Latin curvus "bent, curved," crispus "curly;" Old Church Slavonic kragu "circle;" perhaps Greek kirkos "ring," koronos "curved;" Old English hring "ring, small circlet."
1975, in reference to the style of humor popularized by the comedy troupe in the British TV series "Monty Python's Flying Circus."
street and circus in London, named for Pickadilly Hall, a house that once stood there; the name is of uncertain origin.
"to spoil, ruin," 1812, slang, from queer (adj.). Related: Queered; queering. Earlier it meant "to puzzle, ridicule, deride, cheat" (1790). To queer the pitch (1846) is in reference to the patter of an itinerant tradesman or showman (see pitch (n.1)).
These wanderers, and those who are still seen occasionally in the back streets of the metropolis, are said to 'go a-pitching ;' the spot they select for their performance is their 'pitch,' and any interruption of their feats, such as an accident, or the interference of a policeman, is said to 'queer the pitch,'—in other words, to spoil it. [Thomas Frost, "Circus Life and Circus Celebrities," London, 1875]