To practice economy, as by avoiding waste or reducing expenditures.
To make economical use of something: "The best that can be said for this method is that it economizes on thought” ( Christopher Hitchens).
To use or manage with thrift: the need to economize scarce energy resources.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.