It means "the back".
back (human body).
"Cuidate la espalda" is the translation for "Watch your back".
"Take care of your back."
The body part is "la espalda". To come back is "volver" or "regressar".
Me duele la espalda. This is a very common useage of the reflexive form - literally "The back hurts me." The conjugated form of "dolor" refers to "la espalda", not to "me." That is why it is conjugated in the third person, not the first.
How does your shoulder feel.
masajeame la espalda sobame la espalda
If you mean your back as in the part of your anatomy, the spanish word is "espalda" (S-paul-dah)
"Espalda" is the Spanish word for "back," referring to the rear part of the body. It can also be used metaphorically to indicate support or protection.
tiene su espalda
The cast of La espalda del mundo - 2000 includes: Mehdi Zana as Himself (segment "al palabra")
La espalda del mundo - 2000 is rated/received certificates of: Argentina:13 Peru:14 Spain:13