From Longman Dictionary of Contemporary Englishcinchcinch1 /sɪntʃ/ noun [singular] informal 1 EASYsomething that is very easy ‘How was the exam?’ ‘Oh, it was a cinch!’be a cinch to do something The program is a cinch to install.2 CERTAINLY/DEFINITELY American English something that will definitely happen, or someone who will definitely do somethingbe a cinch to do something Most observers say the president is a cinch to win re-election.
Examples from the Corpus
cinch• I doubted that the load could be lifted, but Leese said it would be a cinch.• Edith finds the cooking a cinch.• There was no manual with the beta version, but the package as a whole is a cinch to use.• He used the third to make a cinch between her hands and the chair's bottom rail.• After that, he was on his own, but the thousand dollars was a cinch.• Today Astrid wore a white satiny dress with a wide gold cinch belt.• Making an ocean is no cinch.be a cinch to do something• Good pie crust is a cinch to make.• The L.A. Dodgers are a cinch to win the division.• Equally important, the battle. net site is a cinch to get to.• There was no manual with the beta version, but the package as a whole is a cinch to use.be a cinch to do something• Equally important, the battle. net site is a cinch to get to.• There was no manual with the beta version, but the package as a whole is a cinch to use.cinchcinch2 verb [transitive] 1 DCto pull a belt, strap etc tightly around something a blue dress cinched at the waist by a wide belt2 CERTAINLY/DEFINITELY American English to make something certain to happen They cinched a place in the play-off.→ See Verb tableExamples from the Corpus
cinch• She had tinted blond hair, large glasses, a blue dress cinched at the waist by a wide glossy belt.• She had her dress cinched at the waist with a belt.• A piece of rope still cinched his neck.• The zip gaped open an inch at his waist, which was cinched in far too tightly by a fake crocodile belt.• The Los Angeles conference really cinched it for me.• Brown hopes to cinch the deal by Monday.Origin cinch1 (1800-1900) Spanish cincha “leather band around a horse”, from Latin cingula 