This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of outfox.

"I teach at a state college and made my students watch "outfoxed," I was appalled by the sheer number of students for whom this was completely new."

outfoxed    outfoxes    outfoxing   

surpass    outmatch    outstrip    outgo    outdo   

outwit    outmaneuver    outsmart    outguess   

Cox    Fox    Foxx    Jocks    Knox