up one's sleeve
Hidden and ready to be produced as needed; in reserve.
I have tried everything I can think of, and I don't have anything more up my sleeve.
ADJ
long, short | full, puffed, voluminous, wide | rolled-up | coat, shirt, etc.
VERB + SLEEVE
push back/up, roll up
He pushed his sleeves up to his elbows before washing the dishes.
roll down
tug at
A young child tugged at her mother's sleeve to show her a picture.
PREP
in ~s
The office was warm, so most workers rolled up their sleeves and got to work.
on a/the ~
My shirt has a small stain on the sleeve from when I was painting yesterday.
PHRASES
in (your) shirtsleeves