challenge
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
These observations have challenged long standing theories about how the first stars and galaxies formed.
From Science Daily
In rising markets, those instincts are rarely challenged.
From MarketWatch
Malaysia’s peanut-butter imports offer a glimpse at the scale of the challenge.
“I have some clean clothes for Boo,” Lou Ann says, “but you”—she looks me up and down—“are a challenge. Those jeans of yours…didn’t anyone tell you not to draw on your clothes?”
From Literature
This challenge has pushed researchers to look beyond the tumor itself and examine broader mechanisms of immune resistance.
From Science Daily
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
