It-does-exactly-what-it-says-on-the-tin definition
(idiomatic, UK, Ireland) What is described or what one would expect with no further explanation needed.
phrase
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Origin of it-does-exactly-what-it-says-on-the-tin
- A series of UK television commercials for Ronseal (sealant products), beginning in the 1990s.
From Wiktionary