The cotton material that extends from the shoulder of your shirt down to your wrists is an example of a sleeve.
The white paper envelope that a CD or record fits into is an example of a sleeve.
A record sleeve.
- Hidden but ready to be used:.I still have a few tricks up my sleeve.
- To prepare to work, esp. at a difficult task requiring prolonged effort.
- Hidden or secret but ready at hand.
Origin of sleeve
- Middle English sleve from Old English slēf sleubh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English sleve, from Old English sliefe, slefe.