Quick answer
"Lie down" is an intransitive verb phrase which is often translated as "acostarse", and "back" is a noun which is often translated as "la espalda". Learn more about the difference between "lie down" and "back" below.
lie down(
lay
 
daun
)
An intransitive verb phrase is a phrase that combines a verb with a preposition or other particle and does not require a direct object (e.g. Everybody please stand up.).
intransitive verb phrase
1. (to recline)
a. acostarse
I have a headache. I am going to lie down for a while.Me duele la cabeza. Me voy a acostar un rato.
b. echarse
This has been a long day. I can't wait until I can return home and lie down in my hammock.Fue un día largo. No veo la hora de volver a casa y echarme en mi hamaca.
c. tumbarse
The dog lay down on the sofa, and fell fast asleepEl perro se tumbó en el sofá y se quedó profundamente dormido.
d. tenderse
Sarah, why don't you go and lie down until you feel better?Sarah ¿por qué no te tiendes hasta que te sientas mejor?
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back(
bahk
)
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
1. (anatomy)
a. la espalda
(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(person)
I will never turn my back on you.Nunca te daré la espalda.
b. el lomo
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(animal)
Put the parcels on the back of the donkey.Pongan los paquetes en el lomo del burro.
2. (reverse side)
a. el respaldo
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(chair)
You can hang your jackets on the back of your chairs.Pueden colgar sus chaquetas en el respaldo de las sillas.
b. el dorso
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(paper)
Please, read the warning on the back of the page.Por favor, lea la advertencia al dorso de la página.
3. (rear part)
a. el fondo
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
There are seats available at the back of the plane.Hay asientos disponibles en el fondo del avión.
An adjective is a word that describes a noun (e.g. the big dog).
4. (rear)
a. trasero
Please, use the back door when leaving.Por favor, usen la puerta trasera para salir.
b. último
I prefer sitting in the back row.Prefiero sentarme en la última fila.
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
5. (to move backwards)
a. dar marcha atrás
She backed her car into the parking place.Dio marcha atrás para meterse en el estacionamiento.
b. retroceder
He would not back his truck out to let me pass.No quería retroceder su camioneta para dejarme pasar.
6. (to support)
a. respaldar
There was no one to back her idea.No había nadie que respaldara su idea.
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
7. (in space)
a. atrás
Step back; the floor is wet.Den un paso atrás; el suelo está mojado.
8. (in time)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Back when I was your age, we walked to school.Allá cuando yo tenía tu edad, caminábamos a la escuela.
Things were different back then.Las cosas eran distintas de aquella.
9. (returned)
a. de vuelta
She went to the store and was back in no time.Fue a la tienda y estuvo de vuelta en cinco minutos.
They will be back at six.Estarán de vuelta a las seis.
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