But, Roderigo, if thou hast that in thee indeed, which I have greater reason to believe now than ever,—I mean purpose, courage, and valour,—this night show it: if thou the next night following enjoy not Desdemona, take me from this world with treachery and devise engines for my life.
There are no more uses of "treachery" in the play.
Show samples from other sources
Benedict Arnold remains the U.S.’s symbol of ultimate treachery.
She was going to get an award for bravery when she should really be kicked out of the Smoke for treachery.