noun
plural cinches
[singular] informal :something that is very easy to do
[singular] chiefly US informal - used to say that something will certainly happen or that someone will easily do something
[count] US :a strap that holds a saddle on a horse
verb
cinches; cinched; cinching
[+ obj] US
to fasten (something, such as a belt or strap) tightly around someone or something
informal :to make (something) certain to happen
US