Source : Webster's Revised Unabridged Dictionary (1913)

Clamp \Clamp\ (kl[a^]mp), v. t. [imp. & p. p. {Clamped}
   (kl[a^]mt; 215) p. pr. & vb. n. {Clamping}.]
   1. To fasten with a clamp or clamps; to apply a clamp to; to
      place in a clamp.

   2. To cover, as vegetables, with earth. [Eng.]