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.
As a result, Rooney's publisher, Faber, determined it could not sell her novels, including Normal People and Conversations with Friends, in the UK.
From BBC ● Oct. 17, 2026
The position remains one of the team’s biggest unknowns, but the preseason could offer some confidence that the Lakers have options.
From Los Angeles Times ● Oct. 17, 2026
“This Act could have helped enormously — and still can! But it needs to actually work, and every voice in support of it matters,” he added.
From Salon ● Oct. 17, 2026
The biggest payday for Dubois could come against the winner of Joshua and Tyson Fury's December showdown, which is expected to have the WBA 'super' title at stake.
From BBC ● Oct. 17, 2026
And I also feel fragile, as if the gentlest breeze could knock me over.
From "Split the Sky" by Marie Arnold
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.