资料来源 : Webster's Revised Unabridged Dictionary (1913)

Spank \Spank\, v. t. [imp. & p. p. {Spanked}; p. pr. & vb. n.
   {Spanking}.] [Of unknown origin; cf. LG. spakken, spenkern,
   to run and spring about quickly.]
   To strike, as the breech, with the open hand; to slap.