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inroad

[in-rohd]
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noun
  1. a damaging or serious encroachment: inroads on our savings.
  2. a sudden hostile or predatory incursion; raid; foray.

Origin of inroad

First recorded in 1540–50; in-1 + road
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for inroad

inroad

noun
  1. an invasion or hostile attack; raid or incursion
  2. an encroachment or intrusion
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

Word Origin and History for inroad

n.

1540s, "hostile incursion, raid, foray," from in- (2) "in;" second element is road in the obsolete sense of "riding;" related to raid. Related: Inroads.

Online Etymology Dictionary, © 2010 Douglas Harper