an unlicensed cab-driver; orig. use seems to be as v.
|Freeman’s Jrnl 21 Sept. 1/5: I drives a cab, that is, I ‘bucks’ for the regular drivers ven they goes for to take a snooze for an hour or so.|
|Vocabulum 15: buck A hack-driver.|
|(con. 1840s–50s) London Labour and London Poor III 352/2: The bucks are unlicensed cabdrivers.|
|Sl. and Its Analogues.|