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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.
limits the pronation and supination of the arm with completely preventing flexion and extension of elbow; applied as a long arm cast but extended above distal biceps; once hardened, the promixal portion of the cast is trimmed around the elbow joint; closer to distal humerus/olecranon= more movement; aka supracondylar cast.