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"high quality, superiority," 1910 (Ritzian, adj., is attested by 1908), in reference to the luxurious Ritz hotels in New York, London, Paris, etc., commemorating Swiss hotelier César Ritz (1850-1918). To put on the ritz "assume an air of superiority" is recorded from 1926. A verb ritz "to behave haughtily" is recorded from 1911.
[entry form 1926+, variant 1934+; fr the name of the Swiss Ce´sar Ritz and the various luxurious European hotels he built; put on the dog fr a late 1800s college, esp Yale, expression]