To get the hang of

from The Collaborative International Dictionary of English v.0.48

Hang \Hang\, n.
   1. The manner in which one part or thing hangs upon, or is
      connected with, another; as, the hang of a scythe.
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   2. Connection; arrangement; plan; as, the hang of a
      discourse. [Colloq.]
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   3. A sharp or steep declivity or slope. [Colloq.]
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   {To get the hang of}, to learn the method or arrangement of;
      hence, to become accustomed to. [Colloq.]
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