To have a secret plan or idea.
Avoir un plan secret ou une idée. (Avoir un plan secret ou une idée.)
"Don’t worry, he has something up his sleeve for the project."
"Ne t'inquiète pas, il a quelque chose dans sa manche pour le projet." (Ne t'inquiète pas, il **a quelque chose dans sa manche** pour le projet.)
doubts or reconsideration about a decision
take a risk hoping for more success
to reduce the time needed for something
having two very different sides to one's character
to feel very happy
a place or situation where one is disconnected from practica...