finish up means to
bring to a conclusion, complete some action.
You finish up
something. But if the
something is understood, you can say just
finish up.
A person finishes up a task, for example.
I finished up my homework.
She still has to finish up washing the dishes.
It's time for dinner and I notice you're still working on your car. Can you please finish up so we can eat?
The
up is optional.
I finished my homework.
She still has to finish washing the dishes.
It's time for dinner and I notice you're still working on your car. Can you please finish so we can eat?
end up means
finally come to be, have a (certain) result.
You don't end up
something.
ending up not an action performed upon a thing.
An
-ing form is very common after
end up.
The
up is not optional before an
-ing form.
If you don't behave, you're going to end up in prison.
(If you don't behave, you will be in prison as a result of it.)
He never studied, so he ended up failing.
(He never studied, so the result was that he failed.)
She couldn't afford the more expensive ring, so she ended up buying the cheaper one.
(She couldn't afford the more expensive ring, so as a result she bought the cheaper one.
She couldn't afford the more expensive ring, so the result of this was that she bought the cheaper one.)
(
Not he ended failing or
she ended buying the cheaper one.)
CJ