flag drop
n.— «The rate increase is the first since 2005, and the second since the Philadelphia Parking Authority (PPA) assumed regulatory authority of local taxis that same year. Though the initial fare, commonly called the “flag drop,” will effectively stay the same at $2.70.» —“Taxi Fares Will Increase In June” by Dan Hirschorn The Bulletin (Philadelphia, Pennsylvania) Feb. 26, 2008. (source: Double-Tongued Dictionary)
Further reading
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