What is the meaning of En_garde?

The command to go to starting positions; used regardless of language of the participants; in the sequence "en garde, prêts, allez".

Used to warn one's opponent to take a defensive position prior to a fight.

Ellipsis of en garde position.; the start position in fencing.

of a ready defensive position

of a state of heightened attention

on guard

Ellipsis of position en garde.; the ready position, ready to attack or defend, in a face-off

Part of the sequence En garde! Prêts? Allez!

Source: wiktionary.org