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1. an arm and a leg, a great deal of money: to cost an arm and a leg. 2. arm in arm, with arms linked together or intertwined: They walked along arm in arm. 3. at arm's length, on terms lacking in intimacy; at a distance: to keep business associates at arm's length. 4. in the arms of Morpheus, asleep.5. put the arm on, Slang. a. to solicit or borrow money from.. arm in arm, with arms linked together or intertwined: They walked along arm in arm. 3. at arm's length, on terms lacking in intimacy; at a distance: to keep business associates at arm's length. 4. in the arms of Morpheus, asleep. 5. put the arm on, Slang.
Doctor's Response: When the blood pressure (BP) is measured, the arm should be at the level of the heart. In other words, in the sitting and standing positions, the arm should be extended out straight and should be about 2-3 inches below the shoulder to approximate the level of the heart. If the arm is allowed to hang down straight, the BP may be falsely diminished by as much as 12 mm Hg. below its true value. This is not an issue when the person is lying down, as long as the arm is kept along side at the level of the body.