padlock
    n 1: a detachable lock; has a hinged shackle that can be passed
         through the staple of a hasp or the links in a chain and
         then snapped shut
    v 1: fasten with a padlock

Padlock \Pad"lock`\, n. [Perh. orig., a lock for a pad gate, or
   a gate opening to a path, or perh., a lock for a basket or
   pannier, and from Prov. E. pad a pannier. Cf. Pad a path,
   Paddler.]
   1. A portable lock with a bow which is usually jointed or
      pivoted at one end so that it can be opened, the other end
      being fastened by the bolt, -- used for fastening by
      passing the bow through a staple over a hasp or through
      the links of a chain, etc.
      [1913 Webster]

   2. Fig.: A curb; a restraint.
      [1913 Webster]

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.
   [1913 Webster]