What is "at the high port"

prep.phr. 1 (context idiomatic military of a weapon English) held with two hands as in "port#Etymology_3", but carried well above the head. The high port is often the position taught for running (at the double) or charging. 2 (context idiomatic by extension English) sticking up; (of hair, etc) standing up at a marked angle 3 (context idiomatic by extension, of anything, not just a weapon English) held in front of the body, especially in an authoritative or aggressive way 4 (context idiomatic slang by extension English) at once, quickly; unhesitatingly, vigorously. 5 (context idiomatic English) Positioned ready for immediate use.