staff of life

staff of life idiom
A staple or necessary food, especially bread. For example, Rice is the staff of life for a majority of the earth's people. This expression, which uses staff in the sense of “a support,” was first recorded in 1638.

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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