IPA: /ˈkaʊntərˌmɑːrtʃ/
KK: /ˈkaʊntərˌmɑrʧ/
To move in the opposite direction, especially in a military formation or as a response to a previous march.
The soldiers were ordered to countermarch after realizing they had gone the wrong way.
Past: countermarched
Past Participle: countermarched
Countermarch → It is formed from "counter-" (meaning against) and "march" (from Old French *marcher*, meaning to walk or move). The word describes the act of marching in the opposite direction or against a previous movement.
Think of marching 'against' ('counter-') a previous direction — that's what countermarch means.