Quick answer
"On and off" is a phrase which is often translated as "a intervalos", and "from time to time" is an adverb which is often translated as "de vez en cuando". Learn more about the difference between "on and off" and "from time to time" below.
on and off
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (general)
a. a intervalos
I was only working on and off during those months.Solo trabajaba a intervalos durante esos meses.
b. intermitentemente
Rafi wasn't an official member of the band, but he played with them off and on.Rafi no era un miembro fijo de la banda, pero tocaba con ellos intermitentemente.
c. de vez en cuando
We weren't really in a committed relationship. We just saw each other on and off.No manteníamos una relación comprometida exactamente. Solo nos veíamos de vez en cuando.
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from time to time(
fruhm
 
taym
 
tuh
 
taym
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (occasionally)
a. de vez en cuando
We don't keep in touch, but our paths cross from time to time.No nos mantenemos en contacto, pero nuestros caminos se cruzan de vez en cuando.
b. ocasionalmente
Sam lives far away, but she comes to visit us from time to time.Sam vive muy lejos pero viene a visitarnos ocasionalmente.
c. de cuando en cuando
We go to the movies from time to time, not too often.Vamos al cine de cuando en cuando, no muy a menudo.
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