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Within a logical or sensible scope of action. I plan to do everything I can to get this job—everything in reason, of course.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Also, within reason. Inside the bounds of good sense, justification, or practicality. For example, We need to keep our prices in reason, or He promised to do what he can to help us, within reason. [Late 1500s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
With good sense or justification; reasonably.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.