under your belt :
below the belt
unfair or unfairly
not in keeping with the rules
In boxing a blow below the belt is a low and therefore unlawful, blow.
belt and braces
(of a policy or action) providing double security by using two means to achieve the same end – British
This meaning developed from the idea of a literal belt and braces holding up a pair of loose-fitting trousers.
2002 - Digital Photography Made Easy - Oddly, the manual is also on CD which seems a bit belt and braces (though useful if you lose the original).
tighten your belt
cut your expenditure
live more frugally
under your belt
(of food or drink) consumed
safely or satisfactorily achieved, experienced or acquired
under your belt :
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