in-and-in
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in-and-in
(ĭn′ənd-ĭn′)adv.
Repeatedly within the same or closely related stocks: to breed pigs in-and-in.
in′-and-in′ adj.
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.
in-and-in
adj
(Biology) (of breeding) carried out repeatedly among closely related individuals of the same species to eliminate or intensify certain characteristics
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014