verb
present participle of ache
adjective
causing a dull and persistent pain
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After the long hike, she felt an aching in her muscles that persisted for days.
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I can't go to the gym today, my legs are aching from yesterday's workout.
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My head is aching so bad, I need to take some painkillers.
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His heart was aching with sorrow after the loss of his beloved pet.