Englishabscond
verb
he had absconded from a Borstal:
run away, escape, bolt, clear out, flee, make off, take flight, take off, fly, decamp;
make a break for it, take to one's heels, make a quick getaway, beat a hasty retreat, show a clean pair of heels, run for it, make a run for it;
disappear, vanish, slip away, steal away, sneak away;
informal do a bunk, do a moonlight flit, cut and run, skedaddle, skip, do a runner, head for the hills, do a disappearing/vanishing act, fly the coop, take French leave, vamoose;
British, informal scarper;
North American, informal take a powder, go on the lam.