[josefresco]

I coached girls recreation basketball and found it weird (after a lifetime of playing basketball) to say "guard your man" or "find your man" etc. "guard your woman" and "guard your girl" also didn't "sound right" although that could be as a result of my bias.

[pwinnski]

When Star Trek first used "...where no one has gone before," it sounded very weird to me. Now it sounds right, and hearing the original series "...where no man has gone before" sounds weird.

Call it bias, call it familiarity, it's probably something like that.

[onecommentman]

Maybe you should talk to a former Marine Drill Instructor to get some creative alternatives...

[TheAdamAndChe]

Interesting one. Would "foe" work?

[neonate]

Nobody uses "foe" that way, at least not in whatever dialect of English I speak. "Opponent" might work.