econ·o·mize /-ˌmaɪz/
  (vt.)(vi.)節約,節省,有效地利用
  E·con·o·mize v. t. [imp. & p. p. Economized p. pr. & vb. n. Economizing.]  To manage with economy; to use with prudence; to expend with frugality; as, to economize one's income. [Written also economise.]
     Expenses in the city were to be economized.   --Jowett (Thucyd. ).
     Calculating how to economize time.   --W. Irving.
  E·con·o·mize, v. i. To be prudently sparing in expenditure; to be frugal and saving; as, to economize in order to grow rich. [Written also economise.]
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  economize
       v 1: use cautiously and frugally; "I try to economize my spare
            time"; "conserve your energy for the ascent to the
            summit" [syn: conserve, husband, economise] [ant:
            waste]
       2: spend sparingly, avoid the waste of; "This move will save
          money"; "The less fortunate will have to economize now"
          [syn: save, economise]