COULD definition: 1. past simple of "can", used to talk about what someone or something was able or allowed to do.. Learn more. We use could have to say that someone had the ability or opportunity to do something, but did not do it: She could have learned Swahili, but she didn't want to. Could is also used to talk about ability in the present, but it has a special meaning. If you say that someone could do something, you mean that they have the ability to do it, but they don't in fact do it.

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