I. cinch 1 /sɪntʃ/ BrE AmE noun [singular] informal
[ Date: 1800-1900 ; Language: Spanish ; Origin: cincha 'leather band around a horse' , from Latin cingula ]
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.
II. cinch 2 BrE AmE verb [transitive]
1 . to pull a belt, ↑ strap etc tightly around something:
a blue dress cinched at the waist by a wide belt
2 . American English to make something certain to happen:
They cinched a place in the play-off.