Is it possible to define the main difference between ”out” and ”off” as particles when they are part of a phrasal verb? I have read the definitions given in the Collins dictionary. And they are many and varied. Is it possible to explain why for example ”out” and not ”off” is used in this or that phrasal verb? For example, to blow off and not blow out? Is it possible to define the etymology of phrasal verbs?

  • Which definition of "blow off" are you talking about?
    – Laurel
    Commented Oct 16, 2018 at 19:51
  • 1
    To answer the question literally, No, it is not possible to define the main difference between out and off as particles in phrasal verbs. That's because there is no "main difference" between them, but rather many, many individual differences that show up with different verbs. There are indeed some tendencies, but they are not easy to describe informally, and they aren't main differences; they're specific, arbitrary, and limited. Commented Oct 16, 2018 at 19:53
  • To blow off = to remove something with great effort. For example, the bomb blew the roof off the house.
    – Tatiana
    Commented Oct 16, 2018 at 19:58
  • @Tatiana: That's not the only definition.
    – Robusto
    Commented Oct 17, 2018 at 1:24

1 Answer 1


As a native BrE speaker, I regularly encounter variants of the form verb + particle. If you watched TV cooking programmes in the 1990s you would have heard frequent reference to things beings "cooked off" or "fried off". In my own kitchen I only cook and fry, never fry off. I asked a friend who is a chef why the 'off' was there: his reply was that that is how chefs speak to each other. Some people who are not chefs have a "fry up". Some people cook up a stew or boil down a sauce. Other times dishes are cooked down, or boiled up, or dried out or baked in.

It might be possible for some linguist to write rules that describe the process of adding particles to verbs in these contexts, but even if that were done those rules would be descriptive rather than prescriptive.

So, in my opinion it is not possible to define the difference between such particles other than purely descriptively, if then. You just have to know.


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