Quick answer
"Fill in" is a transitive verb phrase which is often translated as "rellenar", and "fill out" is a transitive verb phrase which is also often translated as "rellenar". Learn more about the difference between "fill in" and "fill out" below.
fill in
A transitive verb phrase is a phrase that combines a verb with a preposition or other particle and requires a direct object (e.g. Take out the trash.).
transitive verb phrase
1. (to stuff)
a. rellenar
I filled in the hole in the wall to keep the mice out.Rellené el agujero de la pared para que no entraran los ratones.
2. (to write in)
a. llenar
Please fill in this form and then stand in the line until you're called.Por favor, llene este formulario y después póngase en la fila hasta que lo llamen.
b. rellenar
I had to erase a couple of mistakes while filling in the form.Tuve que borrar un par de errores cuando rellenaba el formulario.
c. completar
Please fill in the missing details of your contact information.Por favor, complete los detalles que faltan de sus datos personales.
d. poner (details or information)
Fill in your first name and last name at the bottom of this piece of paper.Ponga su nombre y apellido en la parte inferior de esta hoja.
3. (to spend)
a. ocupar (time)
We filled in the extra hour by going for coffee before our next appointment.Ocupamos la hora que nos quedaba libre tomando un café antes de nuestra siguiente cita.
4. (to inform)
a. poner al corriente
John can you fill in the folks who just arrived?John, ¿puedes poner al corriente a los que acaban de llegar?
b. poner al tanto
What happened in last episode? Can someone fill me in, please?¿Qué pasó en el anterior episodio? ¿Alguien puede ponerme al tanto?
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
5. (to substitute; often used wih "for")
a. estar de suplente
Your physics teacher is sick today, so I'm here to fill in.Su profesora de física está enferma hoy, así que estoy yo de suplente.
b. estar de suplente de
Rachel filled in for Joe at the office while he was away.Rachel estuvo de suplente de Joe en la oficina mientras él estuvo fuera.
c. sustituir a
Mary will fill in for Mr. Gordon's secretary while she is on sick leave.Mary sustituirá a la secretaria del señor Gordon mientras está con licencia por enfermedad.
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fill out(
fihl
 
aut
)
A transitive verb phrase is a phrase that combines a verb with a preposition or other particle and requires a direct object (e.g. Take out the trash.).
transitive verb phrase
1. (to complete)
a. rellenar (form or application)
You will not be considered for the position if you do not fill out the entire application.No podremos considerarte para el puesto si no rellenas la solicitud entera.
b. llenar
Don't fill out the last section. That's for administrative use only.No llenes la última sección. Es solo para fines administrativos.
c. completar
You need to fill out this form and hand it in at reception.Tiene que completar este formulario y entregarlo en recepción.
2. (to make more substantial)
a. rellenar
If you filled out your supporting paragraphs on the second page, your argument would be stronger.Si rellenaras los párrafos de apoyo de la segunda página, tu argumento sería más fuerte.
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
3. (to gain weight)
a. engordar
She filled out so much that I barely recognized her.Ella engordó tanto que apenas la reconocí.
4. (nautical)
a. hincharse
The strong winds caused the ship's sails to fill out.Los vientos fuertes hicieron que las velas del barco se hincharan.
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