(Variations: iced or knocked or made or taped or wired may replace cinched) To be entirely sure of a favorable outcome; be sure of success, well-being, etc: Then you see the helicopter and you know you've got it knocked/ A veteran bank shot artist who has the back boards at West 4th Street wired, does anything he pleases/ I thought I had it iced
[entry form 1900+, most others 1950s+; have something cinched is fr cowboy usage, referring to a tightly and securely cinched saddle; the variants have something made, taped, and wired fr poker terms, also fr cowboy use]