Plunk /(?)/

Plunk

v. t.
  1. To pluck and release quickly (a musical string); to twang. [Chiefly Colloq.]
  2. To throw, push, drive heavily, plumply, or suddenly; as, to plunk down a dollar; also, to hit or strike.
  3. To be a truant from (school). [Scot.]

Plunk

v. i.
  1. To make a quick, hollow, metallic, or harsh sound, as by pulling hard on a taut string and quickly releasing it; of a raven, to croak. [Chiefly Colloq.]
  2. To drop or sink down suddenly or heavily; to plump.
  3. To play truant, or “hooky”. [Scot.]

Plunk

n.
  1. Act or sound of plunking. [Colloq.]
  2. A large sum of money. [Slang]