# fold a line / fold a crease

#### ridgemao

##### Senior Member
Hello, everyone:

MATHEMATICS THROUGH PAPER FOLDING
by ALTON T. OLSON (University of Alberta)

Forming straight lines by folding creases in a piece of paper is an interesting way of discovering and demonstrating relation- ships among lines and angles.
......
56. Line symmetry
Fold a line in a sheet of paper. Cut out a kite-shaped figure similar to figures 56A and 56B.

Is it correct to say "fold creases" and "fold a line" ?
I know the author wanted to express the idea of "create a line or creases by folding the paper".

Thank you.

• #### e2efour

##### Senior Member
I would say that if you fold a piece of paper in half, you get a crease, not a line.
You cannot see a line unless you draw over the crease with a pencil.

No doubt origami experts will say I'm wrong.

#### Packard

##### Senior Member
I am OK with "fold corner A to corner B. The resulting line created by the crease..."

#### heypresto

##### Senior Member
I would say that if you fold a piece of paper in half, you get a crease, not a line.
You cannot see a line unless you draw over the crease with a pencil.

No doubt origami experts will say I'm wrong.
I agree. But in this context, considering what the whole article is about, folding a line is OK. It's clear what the author means.

Indeed the first 'project' is entitled "1. Folding a straight line".

#### ridgemao

##### Senior Member
you get a crease, not a line.
You cannot see a line unless you draw over the crease with a pencil.
"fold a crease" is OK in this context, am I right?

Thank you again.

#### e2efour

##### Senior Member
I suppose so. But if I was an origami instructor, I would say make a crease (in the paper).
It seems clear that you can only do this by folding the paper.

#### entangledbank

##### Senior Member
Yes. You're also folding the paper to make a crease; but we can use some verbs like this on their own results: to iron a crease into trousers, for example, or to hammer a dent into a sheet of copper.

#### Packard

##### Senior Member
The writing ordinarily accompanies a drawing and the drawing shows lines: (The use of "Flog" is slightly or maybe very offensive. Certainly politically incorrect.)

#### ridgemao

##### Senior Member
Thank you every one, now I understand it.

#### heypresto

##### Senior Member
The article is more concerned with mathematics/geometry and constructing things like a line perpendicular to a given straight line, the perpendicular bisector of a given line segment, and finding the midpoint of the hypotenuse of a right triangle, etc by folding paper. So it's the lines made by the creases that are important here, not their part in the construction of a model.

That's why I don't have a problem in this context with 'folding lines'.

#### ridgemao

##### Senior Member
Now I know “fold a crease” is OK, is it also correct to say “fold out a crease” ?

Thank you again.

#### Packard

##### Senior Member
Now I know “fold a crease” is OK, is it also correct to say “fold out a crease” ?

Thank you again.
I think you would attempt (and probably fail) at “pressing out a crease”.

#### ridgemao

##### Senior Member
I think you would attempt (and probably fail) at “pressing out a crease”.
So do you mean I might probably fail at “folding out a crease” too?

Thank you again.

#### Packard

##### Senior Member
So do you mean I might probably fail at “folding out a crease” too?

Thank you again.
Some small remnant of the crease will always remain. That’s probably a physics issue and not an English language issue.

#### ridgemao

##### Senior Member
Hello:

“fold a crease” means to make a crease.
“fold/press out a crease” means to eliminate a crease.

Am I right?

(Now I realize the difference, I thought they were same when I first asked the question)

Thank you.

#### Packard

##### Senior Member
Hello:

“fold a crease” means to make a crease.
“fold/press out a crease” means to eliminate a crease.

Am I right?

(Now I realize the difference, I thought they were same when I first asked the question)

Thank you.
“Fold out” would not be idiomatic in American English. “Press out” is not a standard phrase, but would be my choice for “to eliminate a crease”.

#### ridgemao

##### Senior Member
Thank you so much.

< Previous | Next >