turn tail
     v : flee; take to one's heels; cut and run; "If you see this
         man, run!"; "The burglars escaped before the police
         showed up" [syn: {run}, {scarper}, {lam}, {run away}, {hightail
         it}, {bunk}, {head for the hills}, {take to the woods}, {escape},
          {fly the coop}, {break away}]
Source: WordNet® 2.0