retch
     n : an involuntary spasm of ineffectual vomiting; "a bad case of
         the heaves" [syn: {heave}]
     v 1: eject the contents of the stomach through the mouth; "After
          drinking too much, the students vomited"; "He purged
          continuously"; "The patient regurgitated the food we
          gave him last night" [syn: {vomit}, {vomit up}, {purge},
           {cast}, {sick}, {cat}, {be sick}, {disgorge}, {regorge},
           {puke}, {barf}, {spew}, {spue}, {chuck}, {upchuck}, {honk},
           {regurgitate}, {throw up}] [ant: {keep down}]
     2: make an unsuccessful effort to vomit; strain to vomit [syn:
        {gag}, {heave}]
Source: WordNet® 2.0