[ ruhn-in ]
/ ˈrʌnˌɪn /
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a quarrel; argument.
Printing. matter that is added to a text, especially without indenting for a new paragraph.
Printing. added to a text without indenting.
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
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Origin of run-in

First recorded in 1900–05; noun, adj. use of verb phrase run in
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use run-in in a sentence

British Dictionary definitions for run-in

run in

verb (adverb)
to run (an engine) gently, usually for a specified period when it is new, in order that the running surfaces may become polished
(tr) to insert or include
(intr) (of an aircraft) to approach a point or target
(tr) informal to take into custody; arresthe was run in for assault
noun run-in
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

Other Idioms and Phrases with run-in

run in


Insert or include something extra, as in Can you run this map in with the text? [Early 1800s]


Also, run on. In printing, make a solid body of text without a paragraph or other break, as in The quotation should be run in rather than set as a paragraph.


Also, run someone in. Take someone into custody, as in The police were going to run him in, but he got away. [Slang; mid-1800s]


Visit someone briefly, as in If I have time, I'll run in to see Aunt Mary. [Second half of 1800s]


Break something or someone in, as in Let's run in the new model on a short flight. [Early 1900s] Also see run into.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.