Wiktionary
n. 1 instruction for action. 2 (context idiomatic English) dismissal#English: an instruction to leave.
WordNet
n. (informal) a notice of dismissal or discharge [syn: walking papers]
an order from a superior officer for troops to depart
Usage examples of "marching orders".
But now that he had his marching orders, his attitude seemed to change.
I'll station you in a doorway that won't be very far from their encampment, and then I'll go on in and give them their marching orders.
It was not work that kept him awake, for the last marching orders had been copied and dispatched well before nightfall.
No more marching orders sending him to units that cannot be found.
The names and numbers of regiments, guns and marching orders, all things military were patiently recorded and transcribed.
And he plumped down there and then on his knees, with me alongside, and gave God his marching orders in no uncertain fashion, telling him to keep a sharp eye on his servant.
Theophanu called now, and Captain Fulk shouted the marching orders.