One who aches; a poetic or dialectal term for someone suffering from pain or discomfort.
From the verb 'ache' (to suffer continuous pain) plus the agent suffix '-er' (one who does), creating a noun for a person experiencing aching pain.
Medieval poets and writers used 'acher' to personify pain itself—describing aching bodies as if pain was a being doing the action, giving a haunting quality to descriptions of suffering or illness.
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