verb
A verb is a word that expresses an action or a state of being. In this case, 'ached' is a verb that describes a feeling of pain or discomfort.
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After the long hike, my muscles ached from the exertion.
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I didn't realize how much my feet would ache after standing all day.
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My head was pounding so hard, it ached like crazy.
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Her heart ached with longing for the home she left behind.