Synonyms to go flat out

cut loose, bail out, board, boom, break away, break jail, break loose, break out, carouse, cast loose, celebrate, clap on ratlines, clear, clear hawse, create a disturbance, create a riot, debauch, disembarrass, disembroil, disengage, disentangle, disinvolve, dislodge, escape, escape prison, evade, extricate, flee, fly the coop, free, get away, get clear of, get free, get out, get out of, give way to, go all out, go berserk, go unrestrained, haul, haul down, heave, heave apeak, heave round, heave short, hell around, jollify, jolly, jump, kedge, lark, lay, lay aloft, let go, let loose, let off steam, log, make a commotion, make a getaway, make an ado, make merry, make trouble, make whoopee, open up, raise a ruckus, raise a rumpus, raise a storm, raise hell, ratline down, release, revel, riot, roil, roister, run amok, run riot, run wild, see life, skip, skylark, slip the collar, spar down, spree, step out, stream the log, tear loose, traverse a yard, unknot, unlash, unravel, unsnarl, untangle, wanton, warp, whoop it up, bow to, cater to, coddle, cosset, defer to, favor, go all