Does it Matter? Sign Up vs Signup vs Sign-Up

Recently, I was editing a sign-up sheet. Or a signup sheet? Or is it sign up sheet? Okay, that one is definitely wrong. Right? The answer comes down to parts of speech and where “sign up” is being used in a sentence.

Let’s break it down.

Noun: signup or sign-up are accepted. This form is used when we are talking about the actual sheet. “Stacy, did you get the signup?” or “Hey, I need the sign-up.” I prefer signup in this instance.

Adjective: signup or sign-up are accepted (again). This form is used when the word “signup” is modifying the actual paper. “Will you hand me the signup sheet?” or “I never received the sign-up email.” Most compound adjectives that are formed with two words are hyphenated (aka a two-word adjective). Because of that, I am naturally drawn to sign-up here.

Verb: sign up is correct. This form is used when you are putting your name on the sheet. “I forgot to sign up” or “Grace, go sign up for a slot.”

At a glance:

Noun: signup

Adjective: sign-up

Verb: sign up

Example: Go sign up on the sign-up signup!

(I mean . . . it’s technically correct . . . )