March out (as from a defile) into open ground:
— The regiments debouched from the valley.

synonym: march out.

Roget 295: emerge, emanate, issue; egress; go out of, come out of, move out of, pass out of, pour out of, flow out of; pass out of, evacuate.    exude, transude; leak, run through, out through; percolate, transcolate^†; egurgitate^†; strain, distill; perspire, sweat, drain, ooze; filter, filtrate; dribble, gush, spout, flow out; well, well out; pour, trickle, etc. (water in motion) 348; effuse, extravasate [Med.], disembogue^†, discharge itself, debouch; come forth, break forth; burst out, burst through; find vent; escape etc. 671.    ... show more

Roget 293: depart; go away; take one's departure, set out; set off, march off, put off, start off, be off, move off, get off, whip off, pack off, go off, take oneself off; start, issue, march out, debouch; go forth, sally forth; sally, set forward; be gone; hail from.    leave a place, quit, vacate, evacuate, abandon; go off the stage, make one's exit; retire, withdraw, remove; vamoose [Slang], vamose [U.S.]; go one's way, go along, go from home; take flight, take wing; spring, fly, flit, wing one's flight; fly away, whip away; embark; go on board, go aboard; set sail' put to sea, go to sea; sail, take ship; hoist blue Peter; get under way, weigh anchor; strike tents, decamp; walk one's chalks, cut one's stick; take leave; say good bye, bid goodbye etc. n.; disappear etc. 449; abscond etc. (avoid) 623; entrain; inspan^†.    ... show more

Pass out or emerge; especially of rivers.