Spanish phrase
No estoy ~.
Meaning
I'm not on board ___.
When to use it
Means disagreement or unwillingness to support an idea. Informal tone often used among colleagues or friends to decline or oppose a suggestion.
Example dialogue
Propongo cambiar la fecha.
I suggest changing the date.
No estoy de acuerdo, prefiero la fecha original.
I'm not on board, I prefer the original date.