Hello!! I need to find out if
trick up your sleeve is truco bajo la manga!
2 Answers
I believe it is "guardar una carta en la manga". (loosely translated - to keep a card in the sleeve)
As far as I am aware, yes you are correct. (Please note I am not a native speaker so I could be wrong or there could be a better way to say it, but from what I can find yes that is it.)
Maybe a native speaker will pipe in to correct me if I'm wrong...