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.
noun
The part of a garment that covers the arm.
The sleeves on my coat are too long.
A (usually tubular) covering or lining to protect a piece of machinery etc.
This bearing requires a sleeve so the shaft will fit snugly.
A protective jacket or case, especially for a record, containing art and information about the contents; also the analogous leaflet found in a packaged CD.
A tattoo covering the whole arm.
A narrow channel of water.
Even from Southhampton ' s shore through Wilts and Somerset The Attrebates in Bark unto the bank of Tames Betwixt the Celtic sleeve and the Sabrinian streams
verb
To fit and attach a sleeve to an upper garment (e.g. to a shirt, blouse, sweater, jacket, coat, etc.) or to a folder.
To hide something up one's sleeve.
There are certain types of sleeving that are difficult to perform with the shirt sleeves down, and it is difficult and risky to attempt sleeving while wearing a shirt with "French" cuffs.