It could possibly be either, but the phrase is usually used in a negative situation.
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It is 25 square inches!
measure the Circumference of both the top and bottom edges of the sleeve. measure the height of the sleeve. using a centerline draw the first Circumference(kinda of like a lower case "T") measure down the height of the sleeve along the centerline, draw in the other Circumference. connect the endpoints on the left then the right. you now have a flat drawing from which to measure your dimensions, area, etc.
In order to read a micrometer, you will use the numbers on the thimble and on the sleeve. The numbers on the sleeve are broken down into 4 parts. Think of them as dollars with whole numbers and quarters. The numbers on the thimble can be represented as pennies, or ones. If the sleeve is at 9 3/4 and the thimble is at 4, the reading would be .979.
short sleeves and jeans
This is an old saying which means to have a secret that can be used to benefit them. It comes from the game of poker. Having something up one's sleeve is in reference to those who cheat at poker, often putting an "Ace" up their sleeve which they would then use in their hand to win. It is now used as a reference to a "secret weapon" that can be used to achieve something. For instance, during World War II, the Atomic Bomb was the thing that the US had "up their sleeve" -- a secret weapon that would be used to win the war.