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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.
Arm Span. Arm span measurement is a simple measure that is important in the anthropometrical profiling of athletes in many sports in which reach is important, such as rowing and basketball. See also the related arm length measure, which is the length of each individual arm. Measure from one furthermost finger tip to the other. 2  results: The arm length measures can be compared to the person's height. 3  On average, arm span should be about equal to height. 4  By subtracting a measurement for shoulder width from this measurement you can get a measure of average arm length.