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To be equally involved in something; to work together. You can't do all of this work on your own—why don't we go shares?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To be concerned or partake equally or jointly, as in a business venture.
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.