(Something) does precisely what it claims or is supposed to do. Primarily heard in UK, Ireland. This budget hostel isn't glamorous but does exactly what it says on the tin: it gives you a place to sleep at a very affordable price.This no-frills antivirus software is straightforward and does what it says on the tin.Turns out, this little gadget does exactly what it says on the tin and is indeed perfect for repairing eyeglasses.
(informal, saying) used to say that something is as good or effective as it claims to be, or that it really does what it claims to do. This expression is especially used when you are comparing publicity and advertisements with actual products: I paid £150 for this camera and am more than happy with it. It does exactly what it says on the tin!
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