to fix on

from The Collaborative International Dictionary of English v.0.48
Fix \Fix\, v. i.
   1. To become fixed; to settle or remain permanently; to cease
      from wandering; to rest.
      [1913 Webster]

            Your kindness banishes your fear,
            Resolved to fix forever here.         --Waller.
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   2. To become firm, so as to resist volatilization; to cease
      to flow or be fluid; to congeal; to become hard and
      malleable, as a metallic substance. --Bacon.
      [1913 Webster]

   {To fix on}, to settle the opinion or resolution about; to
      determine regarding; as, the contracting parties have
      fixed on certain leading points.
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