by weight

by weight idiom
According to weight rather than height, volume, or some other measure. For example, In Europe bread often is sold by weight rather than by the loaf. [c. a.d. 1000]

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.

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