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.
To raise the prices even higher at the gas station, he’d have to buy new pumps, an investment he’s not sure he could afford now.
From Los Angeles Times • Apr. 3, 2026
A significant portion of that month’s net job reductions came from striking health care workers, whose work stoppages meant their employers could not include those jobs in the BLS’ surveys.
From Slate • Apr. 3, 2026
"Always my wish is that Rodri could stay as long as possible in this club because he is an incredible, top player but the life of everyone is everyone's."
From BBC • Apr. 3, 2026
One analyst thinks Aehr could announce an additional $30 million to $50 million in orders in the next two months.
From Barron's • Apr. 3, 2026
We joined the stream of people making their way to the stage area, trucks backing up as close as they could get for tailgate seating.
From "Legendary Frybread Drive-In" by Cynthia Leitich Smith
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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.