could
Americanauxiliary verb
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a simple past tense of can.
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(used to express possibility).
I wonder who that could be at the door. That couldn't be true.
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(used to express conditional possibility or ability).
You could do it if you tried.
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(used in making polite requests).
Could you open the door for me, please?
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(used in asking for permission).
Could I borrow your pen?
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(used in offering suggestions or advice).
You could write and ask for more information. You could at least have called me.
verb
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used as an auxiliary to make the past tense of can 1
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used as an auxiliary, esp in polite requests or in conditional sentences, to make the subjunctive mood of can 1
could I see you tonight?
she'd telephone if she could
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used as an auxiliary to indicate suggestion of a course of action
you could take the car tomorrow if it's raining
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(often foll by well) used as an auxiliary to indicate a possibility
he could well be a spy
Usage
See care.
Etymology
Origin of could
First recorded in 1450–1500; alteration of late Middle English coude, coud, Old English cūthe; modern -l- from would 1, should
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.
When CBS’ “Face the Nation” host Margaret Brennan asked whether broadcasting Hasan’s execution could encourage radicalization by turning him into a martyr, Mullin offered a blunt response: “No one has to watch it.”
From Salon ● Oct. 11, 2026
This could lead to more demand for advice on how to deal with debts – but, if you are struggling and need help, there are some traps to avoid.
From BBC ● Oct. 11, 2026
"We are witnessing a perfect storm that could throw tens if not hundreds of millions of people back into poverty."
From Barron's ● Oct. 11, 2026
Researchers at the University of Chicago found personalized pricing could benefit many consumers.
From The Wall Street Journal ● Oct. 11, 2026
“It seems odd to invite Candace over on a random weeknight. It’s Monday. Shouldn’t this be, like, a weekend thing? That way, Aunt J could join us,” he says, feigning innocence.
From "Split the Sky" by Marie Arnold
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
