
Have/keep something up your sleeve
Metaphorical Sleeve
The 'sleeve' in this phrase is not literal but represents a secretive or hidden place.

Let's negotiate, but let's also have a few concessions up our sleeve just in case.
Positive Connotation
Using this phrase usually suggests cleverness or preparedness, rather than deceitfulness.

Don't worry, I have a few ideas up my sleeve that might just work.
Informal Use
This idiom is best for informal conversations and may not suit formal or academic writing.

In our next game, I've got a new strategy up my sleeve.
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