Source : Webster's Revised Unabridged Dictionary (1913)

Padlock \Pad"lock`\, v. t. [imp. & p. p. {Padlocked}; p. pr. &
   vb. n. {Padlocking}.]
   To fasten with, or as with, a padlock; to stop; to shut; to
   confine as by a padlock. --Milton. Tennyson.