Answer: debouch

AnswerCrossword Clue
DEBOUCHMarch out into the open
debouchto emerge from a small space, as a narrow valley, into a larger one
debouchto emerge
debouchto march into the open
debouchto march out from a narrow or confined place into open country, as a body of troops
debouchpassage or opening allowing troops to emerge
debouchan outlet; exit