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"NE swift or the now more common fast may apply to rapid motion of any duration, while in quick (in accordance with its original sense of 'live, lively') there is a notion of 'sudden' or 'soon over.' We speak of a fast horse or runner in a race, a quick starter but not a quick horse. A somewhat similar feeling may distinguish NHG schnell and rasch or it may be more a matter of local preference." [Buck]Quickie "sex act done hastily" is from 1940. Quicklime (c.1400) is loan-translation of L. calx viva.
Sensitive or raw exposed flesh, as under the fingernails. adj. quick·er, quick·est