The Collaborative International Dictionary of English v.0.48:

Treasure \Treas"ure\, v. t. [imp. & p. p. Treasured; p. pr. &
   vb. n. Treasuring.]
   To collect and deposit, as money or other valuable things,
   for future use; to lay up; to hoard; usually with up; as, to
   treasure up gold.
   [1913 Webster]