1. An injury to the muscles, ligaments, or tendons in the back caused by overuse, poor posture, or sudden movement
He suffered a back strain after lifting heavy boxes without proper technique.
Ele sofreu uma distensão nas costas após levantar caixas pesadas sem a técnica adequada.
2. Physical stress or tension in the back region resulting from strain or overexertion
The prolonged sitting caused a back strain that lasted for weeks.
O prolongado período sentado causou uma distensão nas costas que durou semanas.