Search Result for "lockdown": 
Wordnet 3.0

NOUN (1)

1. the act of confining prisoners to their cells (usually to regain control during a riot); 



The Collaborative International Dictionary of English v.0.48:

Lock-down \Lock"-down`\, n.
   A contrivance to fasten logs together in rafting; -- used by
   lumbermen. [U.S.]
   [1913 Webster]


WordNet (r) 3.0 (2006):

lockdown
    n 1: the act of confining prisoners to their cells (usually to
         regain control during a riot)