Hello eugenie62
je confirme que tu étais dans le vrai ; rain check n'a plus grand chose à voir avec la météo 😁 même si, à l'origine, c'était un reçu qu'on te donnait pour "plus tard".
Cf Cambridge dictionary : rain check
noun [ C ] US (also raincheck)
* a piece of paper that you are given by a shop when something that is advertised for sale at a certain price is not available. This piece of paper allows you to buy the product at the advertised price when it becomes available.
* a ticket that allows you to go to an event at a later time if bad weather stops that event from happening
As an amateur subtitle translator from English into Russian with many years of experience, I’d caution against assuming that official dubbings are always accurate. In my experience, even professional dubbing translations can be surprisingly inaccurate at times, especially when it comes to idiomatic expressions.