[in-uh nd-in, -uh n-]


repeatedly within the same family, strain, etc.: to breed stock in-and-in.

Origin of in-and-in

First recorded in 1620–30 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for in-and-in

Historical Examples of in-and-in

  • The red deer of the North Island represent the greatest case of in-and-in breeding of wild animals on record.

    Our Vanishing Wild Life

    William T. Hornaday

  • Unceasingly did the drama practice the in-and-in breeding of sexual problems.

    Romain Rolland

    Stefan Zweig

  • Breeds of animals deteriorate rapidly through lack of nourishment and from in-and-in breeding.

    Riding and Driving

    Edward L. Anderson

  • The more well-bred the animals, the greater are the injurious effects of in-and-in breeding.

  • Few domesticated animals suffer so much from in-and-in breeding as swine.

British Dictionary definitions for in-and-in



(of breeding) carried out repeatedly among closely related individuals of the same species to eliminate or intensify certain characteristics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012