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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.
The measurement of arm length is a simple though important measure in the anthropometrical profiling of athletes for certain sports. See also the similar arm span measurement, which is a measure of the total distance from one fingertip to the other. purpose: Long arms are advantageous for some sports which involve reaching and tackling.