Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Spanish
Origin: cincha 'leather band around a horse', from Latin cingula

cinch

1 noun
     
cinch1 [singular] informal
1 something 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 American English something that will definitely happen, or someone who will definitely do something
be a cinch to do something
Most observers say the President is a cinch to win re-election.

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