Continued dull pain, as distinguished from sudden twinges, or spasmodic pain.
"The old manuscript contained several archaic spellings, including the rare variant 'ache' for the letter h."
parsley
Rare spelling of aitch.
To suffer pain; to be the source of, or be in, pain, especially continued dull pain; to be distressed.
"My head ached all day after staring at the computer screen for hours."
A language spoken by the Yi people of South-Western China.
"The linguist spent months documenting the tonal patterns of Naxi before turning her attention to studying ache in the highlands of Yunnan."
The word "ache" comes from Old English words meaning "to suffer pain." Its ultimate origin traces back to a Proto-Indo-European root related to sin or crime.