spank 1
/spangk/ , v.t.
1. to strike (a person, usually a child) with the open hand, a slipper, etc., esp. on the buttocks, as in punishment.
n.
2. a blow given in spanking; a smart or resounding slap.
[ 1720-30; imit. ]
spank 2
/spangk/ , v.i.
to move rapidly, smartly, or briskly.
[ 1800-10; back formation from SPANKING ]