fly the coop
     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}, {turn tail}, {lam}, {run
         away}, {hightail it}, {bunk}, {head for the hills}, {take
         to the woods}, {escape}, {break away}]
Source: WordNet® 2.0