Merriam-Webster Collegiate Dictionary - discard

 I. verb  Date: circa 1586  transitive verb  1. to get rid of especially as useless or unwanted a pile of ~ed tires  2.  a. to remove (a playing card) from one's hand  b. to play (any card except a trump) from a suit different from the one led  intransitive verb to ~ a playing card  • ~able adjective  • ~er noun Synonyms:  ~, cast, shed, slough, scrap, junk mean to get rid of. ~ implies the letting go or throwing away of something that has become useless or superfluous though often not intrinsically valueless ~ old clothes. cast especially when used with off, away, or out, implies a forceful rejection or repudiation cast off her friends. shed and slough imply a throwing off of something both useless and encumbering and often suggest a consequent renewal of vitality or luster shed a bad habit finally sloughed off the depression. scrap and junk imply throwing away or breaking up as worthless in existent form scrap all the old ways would junk our educational system.  II. noun  Date: 1744  1.  a. the act of ~ing in a card game  b. a card ~ed  2. one that is cast off or rejected