Other forms: backaches
Backache is a pain in the back. Suffer from backache, chronic backache, relieve the backache.
It is among the commonest reasons for missing work anywhere in the world, and most cases have no single identifiable cause. The advice has reversed within living memory: rest was once prescribed and movement now is.
1nounbackacheA pain in the back.
“Sitting at a desk all day gives me terrible backache.”
backache is a pain.
Back plus ache, from Old English aece, a pain.
From back + ache.
Etymology from Wiktionary, CC BY-SA