DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   check off
       v 1: put a check mark on or near or next to; "Please check each
            name on the list"; "tick off the items"; "mark off the
            units" [syn: check, check off, mark, mark off,
            tick off, tick]