does what it says on the tin idiom UK informal
说到做到；实际功能（或服务等）与声称的相符
If something does what it says on the tin, it does exactly what it is intended to do.
The hotel does exactly what it says on the tin and offers customers a relaxing break. 这家旅馆果然能兑现承诺，让客人轻轻松松地享受假期。