gravy time
 n.— «Harrington said the regular drivers complain constantly because the part-time drivers come on the street during the rush hours, called “gravy time,” which run from 7 to 9 a.m. and 4 to 7 p.m.» —“Part-Time Cabbies Face Legal Barrier” by Jean Reiff Washington Post (M3) Sept. 29, 1946. (source: Double-Tongued Dictionary)

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