mortal lock
 n.Note: A cinch, an odds-on favorite, a guaranteed thing or event. «It is a sure bet—a mortal lock as they say in the business— that if Robespierre was around today, we would be standing knee-deep in decapitations.» —“Five Things: Who Will Punish the Bankers?” by Kevin Depew Minyanville (New York) Apr. 6, 2009. (source: Double-Tongued Dictionary)

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