The Collaborative International Dictionary
Port \Port\, v. t. [imp. & p. p. Ported; p. pr. & vb. n. Porting.] [F. porter, L. portare to carry. See Port demeanor.]
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To carry; to bear; to transport. [Obs.]
They are easily ported by boat into other shires.
--Fuller. -
(Mil.) To throw, as a musket, diagonally across the body, with the lock in front, the right hand grasping the small of the stock, and the barrel sloping upward and crossing the point of the left shoulder; as, to port arms.
Began to hem him round with ported spears.
--Milton.Port arms, a position in the manual of arms, executed as above.
Wiktionary
vb. (context military usually as imperative English) To carry one's personal firearm diagonally in front of the body.
Usage examples of "port arms".
And at regular intervals among them, rifles at port arms, marching to a different drum, are the members of two militias: the one from Gail's neighborhood, and the one from Loudon's factory.
The soldier, an AKM assault rifle clutched at a rigid port arms, stiffened to attention.
Strezman gave him a curt nod and went on, as the soldiers went to port arms.
The file of Marines behind Kathryn kept their rifles at port arms, ready for instant action.
He lifted his energy rifle and held it across his chest in port arms as I approached.
With the bright sunlight streaming in from behind the figure, it was a solid black to the seated oligarchs, but there was no doubt the man was a combat-loaded Marine, blaster at port arms.