Definition:
en garde (ɑ̃ ɡard)
interj
1. (Fencing) on guard; a call to a fencer to adopt a defensive stance in readiness for an attack or bout.
adj
2. (Fencing) (of a fencer) in such a stance.
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Only your a driver in your cachemobile and not armed with a sword!
Although I don't know you, you might actually have a sword with you?