You were thinking along the right lines.

FHS Bridge Council of Europe Legal Dictionary:

RESERVER
- QUESTION - réserver une question - (of a court) reserve its decision (reserve judgment) on a question

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Note added at 19 mins (2021-06-08 11:17:12 GMT)
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Case C-70/20: Request for a preliminary ruling ... - EUR-Lexhttp://eur-lex.europa.eu › LexUriServ › LexUriServ
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15 juin 2020 — refrain from ruling on the costs of the first-instance proceedings and of the appeal​, and that the ***decision be reserved*** until final judgment.


Official Journal C 201/15 J - EUR-Lex - European Unionhttps://eur-lex.europa.eu › HTML
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Language of the case: English ... Is the primacy of EU law to be interpreted as permitting a national court to disapply a decision of the ... of the first-instance proceedings and of the appeal, and that the ***decision be reserved*** until final judgment.


PEOPLE v. McBRIDE | 44 N.Y.2d 1001 | N.Y. | Judgment | Law ...https://www.casemine.com › ... › July· Traduire cette page
We decline the People's invitation, extended on appeal for the first time, that ***decision be reserved*** pending a hearing on their assertion that in this instance the


LINK TO THE FHS BRIDGE ENTRY HERE:

https://books.google.fr/books?id=rQAKtn-XjzIC&pg=PA273&lpg=P...

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Note added at 4 days (2021-06-12 14:22:50 GMT)
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You're welcome Julia!